PROJECT DESCRIPTION
The Devil's Gate Reservoir Restoration Project was a three-year effort to increase flood protection for communities downstream of Devil's Gate Dam and restore habitat within a popular section of the Arroyo Seco Watershed.
Los Angeles County Public Works removed 1.3 million cubic yards of sediment from the reservoir immediately behind the nearly 100-year-old dam. In addition to providing flood relief to communities that have endured nearly a decade of elevated flood risk along the Arroyo Seco, the project has established 70 acres of enhanced habitat and recreational opportunities for local communities.
Nearly 42 acres within the reservoir will be maintained annually in the late summer by removing accumulated vegetation and sediment in the basin and repairing erosion from the storm season. The annual maintenance program will allow enhanced native habitat areas to co-exist with reservoir flood control operations and maintenance for the long-term health and well-being of the environment and adjacent communities. By removing accumulated sediment on an annual maintenance schedule, the Flood Control District can minimize the need for any emergency clean out efforts.
Most recent presentationUPDATE: 10/16/24
Devil’s Gate Reservoir Annual Maintenance Completed
Los Angeles County Public Works has successfully completed the 2024 Annual Maintenance at Devil’s Gate Reservoir. The work, which began July 1 and concluded October 10, included removing invasive plants, excavating excess sediment, and repairing erosion. The reservoir’s full flood protection capacity of 3 million cubic yards—equal to 900 Olympic-sized swimming pools—has been restored.
As part of its mission to safeguard communities, Public Works continues to ensure the reservoir is prepared to manage stormwater flows. In addition, habitat restoration is ongoing within 70 acres of the Hahamongna Watershed Park, benefiting native and endangered wildlife. Over 100 active bird nests from more than 25 native species were documented this year.
UPDATE: 8/5/24
NOTICE: Sediment Hauling to Start
Sediment hauling from the reservoir to Sheldon Pit in Sun Valley is scheduled Monday, August 5 through Tuesday, October 15 (Monday – Friday, weekdays between 7 a.m. and 4:30 p.m.).
Public safety is LA County’s top priority. LA County Public Works will enforce the safe driving practices of haulers and follow best management practices to protect the community’s air quality from dust. Additional safeguards include tire washing stations and the use of trucks with low NOx emissions.
Drivers have been advised to drive with caution around certain sections of the route near or alongside equestrian trails and areas where horseback riding may take place.
There will be up to 300 truck trips per day. Work will NOT be conducted on weekends, holidays, days of major Rose Bowl events, or red flag warning days (strong fire potential).
To report concerns along the haul route 24/7, call 1-800-675-HELP (4357).
UPDATED ROUTE: Trucks will enter the reservoir from the facility’s east entrance on Oak Grove Drive, load sediment, exit from the west access ramp onto Oak Grove Drive, and head north to Berkshire Place for freeway access. Trucks will then enter Sheldon Pit via Osborne St. and exiting along Glenoaks Blvd. to Osborne St. See updated route map below.
LA County dams and debris basins reduce flood risk by controlling the amount of water and sediment that is released downstream. The sediment and debris carried by stormwater runoff into these facilities must be removed periodically to ensure enough capacity for flood protection during winter storms. Once removed, this material is transported to sediment placement sites, landfills, and gravel pits.
The Northeast San Fernando Valley— especially the communities of Sun Valley, Sylmar and Pacoima —plays a critical role in regional flood protection and water resilience. Facilities that can receive sediment and debris from local reservoirs and debris basins are critical to the sustainable management of the region’s flood control system.
For any questions or concerns, email devilsgateproject@pw.lacounty.gov or call the Devil's Gate Hotline at (626) 458-2507.
UPDATE: 6/26/24
NOTICE: LA County Public Works Begins 2024 Annual Maintenance for Devil’s Gate Reservoir
THE THIRD ANNUAL DEVIL’S GATE MAINTENANCE WILL BEGIN JULY 1 with hauling operations tentatively scheduled for July 15 through October 15. Work includes clearing vegetation in the reservoir basin and excavating approximately 150,000 cubic yards of excess sediment from the past storm season. Some excess sediment material will also be used to repair eroded side slopes.
Since the completion of the major cleanout work in August 2021, the Devil’s Gate Reservoir can now hold 3 million cubic yards to better manage flood risk. Public Works continues to remove the excess sediment behind the dam to protect downstream communities along the Arroyo Seco, including Pasadena, South Pasadena, and northeast Los Angeles. Ongoing efforts continue to improve the habitat in the Hahamongna Watershed Park, supporting native and endangered wildlife species. Through careful planning, community involvement, and environmental monitoring, an environment where both nature and the community can thrive is being created.
More information on the annual maintenance can be found at: https://pw.lacounty.gov/swe/devilsgate/docs/Devils-Gate-Reservoir-Annual-Maintenance-Plan.pdf
Please feel free to reach out with any questions via email at devilsgateproject@pw.lacounty.gov or call the Devil's Gate Hotline at (626) 458-2507.
UPDATE: 2/15/24
NOTICE: Devil’s Gate Reservoir Flood Protection
The Devil’s Gate Reservoir successfully managed the volume of flows experienced during the recent storm events which totaled more than 8 inches. The storm flows were kept at a safe elevation behind the dam, and controlled releases of water ensured downstream flooding did not occur. The completion of the second annual maintenance of Devil’s Gate, which removed 90,000 cubic yards of sediment (the equivalent of 27 Olympic pools), ensured the reservoir’s flood preparedness for this season.
Following this latest storm event and future storms, water is held in the reservoir to capture floating debris to prevent any risk of damage or clogging of the outlets. Once the debris is cleared, water will be released to create capacity for future storm events and prevent any future flooding.
Please note, access to the reservoir is restricted while water is present. For the public'’'s safety, swimming, boating, kayaking, and any other recreational activities are prohibited.
Public Works appreciates the community’s continued support, and we will continue to provide updates as we manage future storm events. Please feel free to reach out with any questions via email at devilsgateproject@pw.lacounty.gov or call the Devil's Gate Hotline at (626) 458-2507.
UPDATE: 12/18/23
NOTICE: Devil’s Gate Reservoir Annual Maintenance Update
Los Angeles County Public Works is pleased to announce the successful completion of the second annual maintenance program for Devil’s Gate Reservoir. This year’s efforts saw the removal of 90,000 cubic yards of sediment – the equivalent of more than 27 Olympic pools. This timely completion ensures the reservoir’s flood preparedness for the forecasted El Niño, 2023-24 storm season.
LA County remains committed to protecting communities and the environment during and after the annual maintenance work at Devil’s Gate. Maintenance operations included the clearance of excess debris within the reservoir’s basin, allowing controlled water releases when necessary while reducing flood risk, and the hydroseeding of up to seven acres of side-slopes with native plants, to alleviate erosion and dust.
In addition to the successful maintenance program, ongoing habitat restoration has seen the rehabilitation of 70 acres of wetlands and riparian habitat for wildlife and recreation. Notably, over 100 active bird nests were documented in 2023, representing more than 25 native bird species, including species on the “California Species of Special Concern” list.
UPDATE: 11/09/23
NOTICE: Devil’s Gate Reservoir Weather Update.
LA County Public Works is nearing the conclusion of its annual Devil’s Gate Reservoir maintenance operations. Final work on contouring reservoir slopes for storm season is set to continue through November 14, weather permitting.
Due to a high wind advisory, effective November 9 - 11, water trucks will be deployed in an effort to keep dust from escaping the reservoir.
If you have any questions or concerns, please contact LA County Public Works at: devilsgateproject@pw.lacounty.gov or call the project hotline at (626)-458-2507.
Thank you for your continued patience and support as we work to provide a sustainable maintenance regime at Devil’s Gate Dam to protect downstream communities from flooding.
UPDATE: 7/27/23
NOTICE: Devil’s Gate Annual Maintenance to begin August 14, 2023.
Last year, Los Angeles County Public Works removed approximately 25,000 cubic yards of sediment from Devil’s Gate Reservoir over the span of 6 weeks. This allowed the Devil’s Gate Dam to regulate high runoff flows during the storm season to mitigate flood risk to downstream communities.
Public Works will now mobilize for its second year of annual maintenance starting August 14, with hauling operations being conducted September 1 to December 15. This work will include clearing vegetation within the reservoir basin and excavating excess sediment that has been deposited during the past storm season.
- The Hahamonga Watershed Park perimeter trail will remain open to the public. Access to the reservoir is prohibited. Safety measures will be implemented for park visitors.
- Sediment hauling with occur Monday through Friday, 7 A.M. to 3 P.M., work within the reservoir may continue until 6 P.M.
- No work will be conducted on weekends, holidays, or during major Rose Bowl Events.
- The number of truck trips will be limited to 300 per day.
- Haul trucks will enter the facility through the east entrance on Oak Grove Drive and exit via the west access ramp onto Oak Grove Drive, where they will then head north on Berkshire Place for 210 freeway access.
- Best management practices will be implemented to protect air quality during maintenance activities.
Additional details regarding the annual maintenance plan can be found here
Public Works appreciates your patience and understanding as we continue to restore and maintain the reservoir’s flood protection capacity.
UPDATE: 7/17/23
NOTICE: Spring 2023 Newsletter & Habitat Restoration Progress
This past spring, Public Works completed the final phase of plant installations for Devil’s Gate Reservoir Habitat Restoration and will continue to conduct invasive and non-native plant removals to ensure the native habitat thrives. Since the onset of the restoration project, an approximate 8.5 acres of hydroseeding has occurred and 33,000 container plants, native stakes, and 200 oak tree acorns have been planted in the Hahamongna Watershed Park. Additionally, we are pleased to share that the federally endangered Least Bell’s Vireo, and native species such as the Yellow-Breasted Chat and Yellow Warbler are among the birds that have been observed throughout the restored habitat this year.
In early July, Public Works finished draining the seasonal pool in anticipation of the annual sediment removal and maintenance work. Annual sediment removal is expected to begin mid-August 2023, and additional information will be shared in the upcoming weeks.
More details can be found in the Spring 2023 Newsletter
Questions? Contact Public Works at: devilsgateproject@pw.lacounty.gov or call the Devil’s Gate Project Hotline at (626)-458-2507.
UPDATE: 1/19/23
NOTICE: Devil’s Gate Reservoir Flood Protection
The Devil’s Gate Reservoir successfully managed the high volume of flows experienced during the heavier than average rainfall from January’s storm events. The storm flows were kept at a safe elevation behind the dam, and controlled releases of water ensured downstream flooding did not occur. Through the sediment removal project over the last few years, 1.3 million cubic yards of sediment was removed, which allowed the dam to provide necessary flood protection for the downstream communities during the record breaking rainfall.
Following this storm event and future storms, water is held in the reservoir to capture floating debris in order to prevent any risk of damage or clogging of the outlets. Once the debris is cleared, water will be released to create capacity for future storm events and prevent any future flooding. This also allows some of the sediment brought down from the storms to pass through the dam. To learn more, please visit the Devil’s Gate Reservoir Maintenance Plan.
Please note, access to the reservoir is restricted while water is present. For public safety swimming, boating, kayaking, or other recreational activities are prohibited.
Public Works appreciates the community’s continued support, and we will continue to provide updates as we manage future storm events. Please feel free to reach out with any questions by email at devilsgateproject@pw.lacounty.gov or call the Devil’s Gate Project Hotline at (626)-458-2507.
UPDATE: 10/27/22
NOTICE: Devil’s Gate Annual Maintenance Completed
Los Angeles County Public Works began annual maintenance of the Devil’s Gate Dam on September 1, 2022 and completed the restoration on October 20, 2022. This annual fall work is necessary to allow the dam to regulate high runoff flows that may occur during the upcoming storm season, mitigating flood risk to communities downstream.
The work this season included clearing vegetation within the reservoir basin and excavating excess sediment that washed in during the past storm season. Additional time was factored in for erosion repairs along the side slopes and the re-building of a low-flow diversion and two low-flow channels along the side. Habitat restoration will continue throughout 2023.
We thank the community for its patience as we continue to restore and maintain the reservoir’s flood protection capacity.
NOTICE: Devil's Gate Habitat Restoration Borer Beetle Mitigation
The Agriculture Commissioner (AG) hosted an onsite information session on Thursday October 13, 2022 to inform the public and interested parties about the measures being taken to protect the native habitat from invasive shothole borer beetles. Los Angeles County Public Works, in coordination with AG have been investigating a group of trees that showed signs of stress in habitat restoration areas within Devil’s Gate Reservoir.
Public Works and AG have completed the removal of the heavily infested trees and the trimming of lightly infested tree branches on October 21, 2022. The removed trees were woodchipped and will be left under a tarp near the west Hahamongna parking lot to solarize for the next 6 months. This practice ensures that the infestation does not spread.
To learn more about the shothole borer beetle, please visit www.ishb.org.
UPDATE: 10/6/22
NOTICE: Devil's Gate Habitat Restoration Borer Beetle Informational Session – October 13, 2022 @ 5pm
Information Session: Borer Beetle Mitigation
The Agriculture Commissioner will be hosting an information session to inform the public and interested parties about the infestation and measures being taken to protect the native habitat, and will be hosted on site. To learn more about the shothole borer beetle, please visit www.ishb.org.
Date: October 13, 2022
Time: 5:00 PM
Location: Near the west area parking lot
Background:
Public Works, in coordination with County Agricultural Commissioner, investigated a group of trees that showed signs of stress in Habitat Restoration areas within Devil’s Gate Reservoir. An invasive pest, the shothole borer beetle, was found during the investigation and was determined to be impacting the health of the trees.
The Agricultural Commissioner, with assistance from Public Works, will be removing five heavily infested trees, three cottonwoods and two black willows, to help slow the spread of the beetle. Additional tree trimming of lightly infested trees will be an on-going process to mitigate the impact of the beetles, and will be conducted outside of bird nesting season.
Removal and monitoring locations.
If you have questions you may contact us at devilsgateproject@pw.lacounty.gov. Hotline staff are available by telephone at (626) 458-2507.
UPDATE: 8/18/22
NOTICE: Devil’s Gate Annual Maintenance to begin September 1, 2022; Annual Maintenance Plan Posted
Over the last three years, Los Angeles County Public Works removed 1.3 million cubic yards of sediment from Devil’s Gate Reservoir. This allowed the Devil’s Gate Dam to regulate high runoff flows during the 2021-22 storm season, to mitigate flood risk to communities downstream.
Public Works will now conduct its annual maintenance of the reservoir from September 1 to December 15 to prepare the facility for the upcoming storm season. The work will include clearing vegetation within the reservoir basin and excavating excess sediment that washed in during the past storm season. Additional time is factored for the erosion repairs along the side slopes and the re-building of a low-flow diversion and two low-flow channels along the side slopes that serve the two maintenance areas at the bottom of the reservoir.
We appreciate your patience as we continue to restore and maintain the reservoir’s flood protection capacity.
- The Hahamongna Watershed Park perimeter trail will remain open, but access into the reservoir will be restricted during working hours. Safety measures will be implemented for park visitors.
- Sediment hauling will occur Monday through Friday, 7 a.m. to 3 p.m. and work within the reservoir may continue until 6 p.m.
- No work will be conducted on weekends, holidays, or during major Rose Bowl events.
- Trucks entering the reservoir from the facility’s east entrance on Oak Grove Drive will be loaded with sediment, exit the west access ramp onto Oak Grove Drive, and head north to Berkshire Place for freeway access.
- Best management practices will be followed to protect air quality.
For more information and details regarding the Annual Maintenance, please refer to the ANNUAL MAINTENANCE PLAN.
You can also ask questions by email at devilsgateproject@pw.lacounty.gov or call the Devil’s Gate Project Hotline at (626) 458-2507
UPDATE: 8/16/22
*Reminder*: Southeast Entrance Improvement Project – Open House and Virtual Meeting August 17 and 18, 2022 at 6:00pm – Presentation posted below
Join Los Angeles County Public Works for two community meetings on the Devil's Gate Southeast Entrance Improvement Project. Public Works will be sharing the updated proposed project that was developed after receiving public input from previous community meetings.
On Wednesday, August 17, from 6pm to 7 pm, Public Works will be hosting an on-site open house at the Southeast Entrance. Renderings of the proposed projects will be on display. Staff will be available to answer questions.
Click here to view a map of the meeting location. Please be mindful of parking restrictions and neighbors when visiting the site.
Please do not attend if you have any COVID-19 symptoms, have been asked to quarantine or isolate, have had known contact with a COVID-19 positive individual, or are waiting for the results of a COVID-19 test.
On Thursday, August 18, from 6pm to 7pm, Public Works will be hosting a virtual community meeting that will provide a more in depth look at the updated proposed project.
The presentation will be published on the Devil’s Gate website 48 hours in advance of the virtual meeting.
UPDATE: 7/14/22
Notice: *POSTPONED* Southeast Entrance Improvement Project – Community meeting July 18, 2022 at 6:00pm
The community meeting regarding the Southeast Entrance Improvement Project scheduled for Monday, July 18, 2022 at 6:00pm has been postponed. Once a new meeting date has been confirmed, the website will be updated and a new invitation and registration link will be distributed. Thank you for your interest and understanding. If you have any questions you may contact us at devilsgateproject@pw.lacounty.gov.
UPDATE: 7/7/22
Notice: Southeast Entrance Improvement Project – Community meeting July 18, 2022 at 6:00 pm
Join Los Angeles County Public Works for a virtual community meeting on the Devil's Gate Southeast Entrance Improvement Project. Public Works will present the project concept developed after receiving public comments gathered from the community.
If you have questions you may contact us at devilsgateproject@pw.lacounty.gov or call the Devil’s Gate Project Hotline at (626) 458-2507.
UPDATE: 6/27/22
Notice: Devil’s Gate Reservoir Drainage – July 1, 2022
We are pleased to announce that the sediment removal project successfully provided flood protection for downstream communities and runoff flows from the October and December storm events were fully controlled within the reservoir.
After the storm season ended in April, releases from the dam were reduced to allow for a seasonal pool of water. On July 1, 2022, the small amount of water that is left of the seasonal pool will be drained in anticipation of the annual sediment removal and maintenance work.
Drainage of the reservoir is expected to occur over 1-2 days.
As always, you can contact the team through email: devilsgateproject@pw.lacounty.gov or the telephone Hotline: (626) 458-2507.
UPDATE: 5/23/22
Notice: Implementation of Habitat Restoration Phase 3
The initial sediment removal for the Devil’s Gate Reservoir Restoration Project was completed early, but extensive habitat restoration efforts continue. Work has begun on Phase 3 restoration activities on the side slopes surrounding reservoir, the location of the previous tire wash, and portions of the west mitigation region, as outlined in the Habitat Restoration Plan, approved by California Department of Fish and Wildlife. The work includes grading to recontour the soil and improve water distribution through the mitigation area and direct water flow following storm events.
Phase 3 includes the use of some heavy equipment on the west side of the restoration area for recontouring soil. Project work is performed between 7 a.m. to 3:30 p.m., the same as the sediment removal work hours. This grading work is expected to be completed by July 2022. Phase 3 grading will be followed by planting and seeding with native riparian species.
In the previous phases, Public Works planted 300 live oak accords, over 10,000 container plants, and 700 pounds of seeds to restore a natural habitat to the Devil’s Gate Reservoir.
We are pleased that the federally-endangered Least Bell’s Vireo and Willow Flycatchers are among birds observed throughout the restored habitat. Over the coming year, Public Works will continue with its habitat restoration to encourage the return of even more native species.
Questions? Contact Public Works at: devilsgateproject@pw.lacounty.gov or call the Devil’s Gate Project Hotline at (626) 458-2507.
UPDATE: 2/1/22
Notice: Southeast Entrance Improvement Project – Third Community Presentation & Open Comment Period
Los Angeles County Public Works hosted a third community meeting on the Devil's Gate Southeast Entrance Improvement Project on January 31, 2022 to showcase design alternatives.
Please submit votes, comments, questions or share concerns for the Southeast Entrance at devilsgateproject@pw.lacounty.gov or call the Devil’s Gate Project Hotline at (626) 458-2507 through February 14, 2022.
The presentation with the designs can be found here: Presentation.
Update: 1/18/22
Notice: Save the Date – January 31, 2022, 6pm to 7pm – Southeast Entrance Improvement Project – Third Meeting
Los Angeles County Public Works will be hosting a virtual community meeting on the Devil's Gate Southeast Entrance Improvement Project on January 31, 2022, at 6 PM via Zoom.
Join us to view current design alternatives and provide additional public input. This will be the third public meeting.
Registration and zoom meeting link: Zoom.
If you have questions you may contact us at devilsgateproject@pw.lacounty.gov. Hotline staff are available by telephone at (626) 458-2507. You may also visit DevilsGateProject.com for additional resources.
Update: 11/17/21
Notice: Southeast Entrance Improvement Project – Design Alternative Presentation & Open Comment Period
Los Angeles County Public Works hosted a second community meeting on the Devil's Gate Southeast Entrance Improvement Project on November 15, 2021 to showcase design alternatives.
Please submit comments and questions or share concerns for the Southeast Entrance at devilsgateproject@pw.lacounty.gov or call the Devil’s Gate Project Hotline at (626) 458-2507 through December 2, 2021.
A third meeting will be scheduled for January 2022.
View the presentation with the designs.Update: 11/3/21
Notice: Save the Date - November 15, 2021, 6pm to 7pm – Southeast Entrance Improvement Project - Second Meeting
Los Angeles County Public Works will be hosting a virtual community meeting on the Devil's Gate Southeast Entrance Improvement Project on November 15, 2021, at 6 PM via Zoom.
Join us to view current design alternatives and provide additional public input. This will be the second of three public meetings.
Registration and zoom meeting link: Zoom.
Los Angeles County Public Works will be hosting a virtual community meeting on the Devil's Gate Southeast Entrance Improvement Project on November 15, 2021, at 6 PM via Zoom.
Join us to view current design alternatives and provide additional public input. This will be the second of three public meetings.
Update: 9/13/21
Notice: Save the Date - September 27, 2021, 6pm to 7pm – Southeast Entrance Improvement Project
As part of the Project closeout, Public Works is seeking public input to develop plans and improvements to the southeast entrance. This will be the first of three virtual public meetings.
Registration and zoom meeting: https://pw.lacounty.gov/go/SeEntrance
Los Angeles County Public Works is pleased to announce that sediment removal at Devil’s Gate Reservoir was completed on August 10. As part of the Project closeout, Public Works is seeking public input to develop plans and improvements to the southeast entrance. This will be the first of three public meetings.
Zoom Link https://pw.lacounty.gov/go/SeEntrance
Notice: Construction Completion - September 30, 2021
Los Angeles County Public Works is pleased to announce that sediment removal at Devil’s Gate Reservoir was completed on August 10. By September 15, and September 30, the County will finish final construction work at Devil’s Gate Reservoir and Manning Pit, respectively. The County extends our thanks to the community for its input, support and patience since the project’s start in November 2018. We are pleased that we were able to complete the sediment removal in an expedient and timely manner without creating major disruptions.
The planned four-year effort to remove 1.7 million cubic yards of sediment from Devil’s Gate Reservoir was accelerated by efficient sediment removal and favorable weather conditions. The project restored the facility’s flood control capacity to protect communities downstream while establishing a new permanent maintenance area.
Los Angeles County Public Works will continue to work on habitat restoration project., restoring native habitat on the surrounding 70 acres. Almost 60% of the native vegetation planted is being obtained from the Hahamongna Native Plant Nursery.
Los Angeles County Public Works expresses special appreciation to the local residents, the Community Advisory Committee, local stakeholders, neighbors and businesses in the communities of Altadena, La Cañada, Pasadena, Irwindale, and Sun Valley for their continued collaboration in our efforts.
For more information on the full range of enhancements at Devil’s Gate Reservoir, visit the website at DevilsGateProject.com. You can also ask questions or share your concerns at devilsgateproject@dpw.lacounty.gov or call the Devil’s Gate Project Hotline at (626) 458-2507.
Update: 8/9/21
Notice: Sediment Removal to be completed on August 10, 2021
The planned four-year effort to remove 1.7 million cubic yards of sediment from Devil’s Gate Reservoir is concluding a year earlier than expected. Contributing factors include efficient sediment removal and favorable weather conditions. The Devil’s Gate Reservoir Restoration Project began in December 2018. The project was designed to restore the facility’s flood control capacity to protect the communities downstream while establishing a permanent maintenance area and restoring native habitat in the surrounding 70 acres.
Los Angeles County Public Works would like to thank the local residents, the Community Advisory Committee, local stakeholders, neighbors and businesses in the communities of Altadena, La Cañada, Pasadena and Sun Valley for their continued collaboration and patience through to the completion of this project.
Public Works team members will continue to perform finishing construction activities within the reservoir through November of this year. The habitat enhancement component of the project will continue though fall 2022.
For more information on the full range of enhancements at Devil’s Gate Reservoir, visit the website at DevilsGateProject.com. You can also ask questions or share your concerns at devilsgateproject@dpw.lacounty.gov or call the Devil’s Gate Project Hotline at (626) 458-2507.
Update: 5/12/21
Notice: UPDATED: Sediment Removal to Start May 17, 2021
LA County Public Works will resume sediment removal at Devil’s Gate Reservoir on Monday, May 17 and continue its operations through November. Hauling hours are from 7 a.m. to 3:30p.m., Monday through Friday.
- Upgrading the 2021 hauling fleet in an effort to improve truck emissions performance
- Pre-watering sediment prior to the loading of the trucks
- Watering all loaded trucks before they leave the reservoir to control material from blowing out of truck beds
- Maintaining tire wash stations to remove dirt from tires and undercarriages of trucks
- Street sweepers continuously sweeping paved surfaces, including the truck access ramp and the locally sediment haul routes
For more information on the full range of enhancements at Devil’s Gate Reservoir, visit the website at DevilsGateProject.com. You can also ask questions or share your concerns at devilsgateproject@dpw.lacounty.gov or call the Devil’s Gate Project Hotline at (626) 458-2507.
Update: 4/16/2021
Notice: Sediment Removal to Start May 3, 2021
LA County Public Works will resume sediment removal at Devil’s Gate Reservoir as early as May 3, 2021, and continue these operations through November. LA County Public Works in coordination with the contractor, Griffith Company, began preparations on April 19 to resume sediment excavation and removal inside the reservoir. We’re farther along in excavation and removal quantity from the reservoir than originally predicted. Therefore, the project may very likely be completed by the end of November 2021.
Public Works is dedicated to a community-first approach and has adopted numerous measures to keep communities safe, neighborhood streets clean and traffic impacts to a minimum. To date, the project team successfully removed more than 980,000 cubic yards of sediment. Meanwhile, habitat restoration activities continue in the project natural areas.
To protect hikers, cyclist and workers during construction, a number of trails within the reservoir, including the tunnel to the Lower Arroyo Seco Trail, will be closed during project work hours, Monday through Friday, from 7:00 a.m. – 3:30 p.m.
The Rose Bowl Loop and recreational trails within Hahamongna Park and along the north side of the reservoir will remain open to visitors. Please refer to the trail closure map for details
For more information on the full range of enhancements at Devil’s Gate Reservoir, visit the website at DevilsGateProject.com. You can also ask questions or share your concerns at devilsgateproject@pw.lacounty.gov or call the Devil’s Gate Project Hotline at (626) 458-2507.
Update: 12/10/20
Notice: Continued work on Habitat Restoration Phase 2
Due to an unavoidable delay, please be advised that grading work for Habitat Restoration at Johnson Field and Mining Pit previously scheduled to be completed by mid-December is now anticipated to conclude in late December 2020. As previously noticed, light construction equipment will be in use. Public access to trails will be open at all times. Working hours will be from 7 a.m. to 5 p.m. Grading work to properly contour slopes will be followed by planting and seeding with native riparian species.
For more information on the full range of enhancements at Devil’s Gate Reservoir, visit the website at DevilsGateProject.com. You can also ask questions or share your concerns at devilsgateproject@pw.lacounty.gov or call the Devil’s Gate Project Hotline at (626) 458-2507.
Update: 11/23/20
Notice: Continued Implementation of Habitat Restoration Phase 2
Grading work for Habitat Restoration at Johnson Field and Mining Pit is expected to continue up until mid-December 2020. During this time light construction equipment will be in use. Public access to trails will be open at all times. Working hours will be from 7 a.m. to 5 p.m. Grading work to properly contour slopes will be followed by planting and seeding with native riparian species.
Active Habitat Restoration will continue this fall and winter with the shaping of new channels through restoration areas followed by the installation of hundreds of container plants and cuttings from willows and mulefat. Seed mixes of native riparian plants and flowering annual plants will also be applied, which should result in a very colorful spring in the restoration areas. Weed abatement activities continue as a year-round activity to control non-native and invasive plants and to allow native vegetation to thrive without competition. Crews tending native landscaping will be busy hand-pulling weeds, operating string-trimmers, and even using steam augers to kill the very invasive weeds. With the intensive habitat restoration efforts being implemented this fall and winter, the riparian areas should quickly grow into multi-layered habitat areas capable of supporting a wide diversity of wildlife species.
For more information on the full range of enhancements at Devil’s Gate Reservoir, visit the website at DevilsGateProject.com. You can also ask questions or share your concerns at devilsgateproject@pw.lacounty.gov or call the Devil’s Gate Project Hotline at (626) 458-2507.
Update: 10/6/20
Notice: Implementation of Habitat Restoration Phase 2
Beginning Wednesday, October 7th, Los Angeles County Public Works will begin implementation of Phase 2 of the habitat restoration activities as detailed in the California Department of Fish and Wildlife-approved Habitat Restoration Plan for the Devil’s Gate Reservoir Restoration Project over an approximate one-month period. The work will include grading that will recontour soil and help improve conveyance of water flow during inclement weather as well as improve the distribution of water throughout the mitigation area. Phase 2 will include the use of construction equipment for grading soil in Johnson Field, the Mining Pit, and areas adjacent to the Mining Pit. The improved hydrology will better convey flows within the restoration area for the benefit of the habitat. This construction activity, under supervision of Public Works and the County's environmental consultant, is separate from the reservoir sediment removal operations. Some soil from the habitat area will be exported to Manning Pit. This project work will occur during the same hours as the regular sediment removal schedule (7 a.m. to 3:30 p.m.) and it is expected to be completed by mid-November 2020, weather permitting. Public Works will maintain the same dust mitigation protocols and continue to monitor the air quality in the new work areas.
The Phase 2 grading work will be followed by planting and seeding with native riparian species, approximately 50 percent of which will be harvested from the Hahamongna Watershed Park by the Hahamongna Native Plant Nursery. In Phase 1 of the habitat restoration, 300 coast live oak acorns, 10,346 container plants, and approximately 713 lbs. of seeds have already been planted.
For more information on the full range of enhancements at Devil’s Gate Reservoir, visit the website at DevilsGateProject.com. You can also ask questions or share your concerns at devilsgateproject@pw.lacounty.gov or call the Devil’s Gate Project Hotline at (626) 458-2507.
Update: 9/24/20
Notice: A message to our partners
We've had a change in the Public Works Devil's Gate team. Civil Engineer Fahim Rahimi is taking over as Construction Manager/Community Liaison for the project from Brittany Barker who is embarking on new endeavors out of state. Public Works Assistant Deputy Director Steve Burger continues to manage the project.
Fahim is looking forward to keeping the same lines of communication open with the community and our partners, and he continues to have the same Public Works support team behind him. Fahim can be reached by email at: frahimi@pw.lacounty.gov or by phone at (626) 476-2737.
As always, you can contact the team through the central project email: devilsgateproject@pw.lacounty.gov or the telephone Hotline: (626) 458-2507.
Update: 8/27/20
Notice: "Second season" hauling moves to Irwindale
Hauling activities for the 2020 season commenced at Devil’s Gate Reservoir on June 4. Since that date, all material has been delivered to Sheldon Pit in the Sun Valley area while Manning Pit in the City of Irwindale was prepared for use. We are anticipating the start of sediment hauling to Manning Pit to tentatively begin on Tuesday, September 1. Hauling is expected to continue through November. Hauling operation hours in the Irwindale area are approximately 7:30 a.m. through 4:30 p.m., Monday through Friday. There will be no hauling associated with our project on weekends.
Haul route map can be found here. Please note the route in and out of the site was modified from last season. Public Works is partnering with the South Coast Air Quality Management District to closely monitor the streets to ensure that dust is controlled. We encourage community members to contact us immediately if they observe dust or have any other concerns regarding the hauling operation. Please contact us at (626) 458-2507 or the South Coast Air Quality Management District hotline at (800) CUT-SMOG.
Update: 8/12/20
Notice: Change of Haul Routes to Start August 17, 2020
Beginning Monday, August 17, LA County Public Works will transition to the In-School haul route at Devil’s Gate Reservoir. That hauling route can be found here.
Although we understand schools are starting the year with off-site distance learning, we want to ensure that our hauling does not impact school transitioning schedules at such time as in-person schooling might resume. Also, by continuing with the same hauling pattern as in the previous year, we are maintaining the commitment to balance the truck traffic between the communities of Pasadena and Altadena on the east side of the reservoir and La Cañada Flintridge on the west side.
For more information on the full range of enhancements at Devil’s Gate Reservoir, visit the website at DevilsGateProject.com. You can also ask questions or share your concerns at devilsgateproject@pw.lacounty.gov or call the Devil’s Gate Project Hotline at (626) 458-2507.
Update: 6/2/20
Notice: UPDATED: Sediment Removal to Start June 4, 2020
LA County Public Works will resume sediment removal at Devil’s Gate Reservoir on Thursday, June 4, and continue its operations through November. Hauling hours are from 7 a.m. to 3:30 p.m., Monday through Friday.
- Pre-watering sediment prior to the loading of the trucks
- Watering all loaded trucks before they leave the reservoir to control material from blowing out of truck beds
- Street sweepers continuously sweeping paved surfaces, including the truck access ramp and the local sediment haul route
- Maintaining tire wash stations to remove dirt from tires and undercarriages of trucks
- Pavement treatment for local haul routes.
- Traffic signal improvements at major intersections along the sediment removal route to add dedicated left turn arrows for more efficient traffic flow and increased safety
This year, improvements to air quality monitoring systems are in place and LA County Public Works is pleased to announce the launch of a new real-time air monitoring website. We welcome feedback and are committed to making improvements to allow community members to make more informed decisions.
For more information on the full range of enhancements at Devil’s Gate Reservoir, visit the website at DevilsGateProject.com. You can also ask questions or share your concerns at devilsgateproject@dpw.lacounty.gov or call the Devil’s Gate Project Hotline at (626) 458-2507.
Update: 5/28/20
Notice: Sediment Removal to Start June 3
LA County Public Works will resume sediment removal at Devil’s Gate Reservoir on June 3rd and continue these operations through November.
Public Works is dedicated to a community-first approach and has adopted numerous measures to keep communities safe, neighborhood streets clean and traffic impacts to a minimum. In the first year of its reservoir restoration project, the project team successfully removed more than 445,000 cubic yards of sediment—26% of its overall project goal.
To protect hikers, cyclists and workers during construction, a number of trails within the reservoir, including the tunnel to the Lower Arroyo Seco Trail, will be closed, Monday through Friday, from 6:45 am - 4 pm. The Rose Bowl Loop and recreational trails within Hahamongna Park and along the north side of the reservoir will remain open to visitors. Please refer to the trail closure map for details.
For more information on the full range of enhancements at Devil’s Gate Reservoir, visit the website at DevilsGateProject.com. You can also ask questions or share your concerns at devilsgateproject@dpw.lacounty.gov or call the Devil’s Gate Project Hotline at (626) 458-2507.
Update: 5/20/20
Notice: Hiring Local & Targeted Workers
Los Angeles County Public Works is looking to hire truck operators this spring from Altadena, Pasadena and neighboring communities to work on the Devil’s Gate Reservoir Restoration Project.
During the COVID-19 health and economic crisis, LA County Public Works is recruiting nearly a third of its project workforce from local community members, as well as others who are experiencing eligible hardships. LA County Public Works is committed to the delivery of uninterrupted essential services to the public. For more information on this exciting opportunity, see the job flyer and presentation found here.
Update: 5/18/20
Notice: Construction to Resume This Week at Devil's Gate Reservoir
Work on the Devil’s Gate Reservoir Restoration Project will resume as early as Wednesday, May 20, with the mobilization of construction equipment and work within the reservoir. Sediment removal activities are anticipated to begin the week of Monday, June 8. A separate email to community members and other project stakeholders will be sent prior to the start of sediment hauling.
LA County Public Works is working closely with the California Department of Fish and Wildlife to protect and preserve native habitat and wildlife, with biologists on-site daily to monitor construction activities.
For more information, please visit the project website at DevilsGateProject.com, email Public Works at devilsgateproject@dpw.lacounty.gov or call the Devil’s Gate Project Hotline at (626) 458-2507.
Update: 4/22/20
Notice: Construction to Resume at Devil's Gate Reservoir
With the close of the winter storm season, Los Angeles County Public Works is preparing to resume work on the Devil's Gate Reservoir Restoration Project. Critical infrastructure projects, like the work being done at Devil’s Gate Dam, are considered essential services by the State of California, and LA County Public Works is dedicated to a community-first approach as it moves forward in this multi-year effort.
Construction operations will resume next Monday, April 27, with the mobilization of construction equipment and materials within the reservoir. Sediment removal activities are anticipated to begin on Tuesday, May 12. A separate email will be sent prior to the start of sediment hauling to confirm the exact start date. Workers on the project site will adhere to state and local guidelines regarding COVID-19.
For more information on the project, please visit the project website at DevilsGateProject.com, email Public Works at devilsgateproject@dpw.lacounty.gov or call the Devil’s Gate Project Hotline at (626) 458-2507.
Update: 4/20/20
Notice: Construction Activities to Resume at Devil’s Gate Reservoir
Los Angeles County Public Works is preparing for its second year of work on the Devil’s Gate Reservoir Restoration Project. Workers will be remobilizing construction equipment and preparing the site for sediment removal activities in the coming weeks. A separate notification will be provided prior to the start of sediment hauling. Sediment removal at Devil’s Gate Reservoir is necessary to provide flood relief to downstream communities that have endured nearly a decade of elevated flood risk. Habitat restoration activities continue on-site to create over 70 acres of enhanced habitat for wildlife.
For more information on the project, please visit the project website at DevilsGateProject.com, email Public Works at devilsgateproject@pw.lacounty.gov or call the Devil’s Gate Project Hotline at (626) 458-2507..
Update: 4/2/20
Notice: Weather delay to road improvements
Rain in the forecast has delayed road improvements to Oak Grove Drive and Berkshire Place. LA County Public Works has rescheduled the microsurfacing work along Oak Grove Drive and a portion of Berkshire Place in the cities of La Cañada Flintridge and Pasadena to April 13-16, with final roadway striping to be performed by April 17, weather permitting.
Working hours are from 7 am to 5 pm, and traffic may be reduced to one lane in each direction during construction. Call the project hotline at (626) 458-2507 with any questions or visit the project website at devilsgateproject.com.
The project team thanks you for your patience.
Update: 3/27/20
Notice: Road improvements coming to Oak Grove Drive and Berkshire Place
To protect and preserve the local roads used by haul trucks during the Devil’s Gate Reservoir Restoration Project, LA County Public Works will perform microsurfacing work along Oak Grove Drive and a portion of Berkshire Place in the cities of La Cañada Flintridge and Pasadena.
Microsurfacing is a paving operation that is similar to slurry seal. The process consists of the application of a mixture of water, asphalt emulsion, aggregate (very small crushed rock), and chemical additives to an existing asphalt concrete pavement surface. The application hardens quickly and can be used when conditions would not allow slurry seal to be successfully placed. Streets with substantial shade or a relatively high volume of traffic are good candidates for microsurfacing.
New striping will be installed along treated road segments with additional signage and pavement markings added for improved safety for all roadway users. Work will be performed April 6-10, during the La Cañada Unified School District Spring Break, with final roadway striping performed by April 11.
Working hours are from 7 am to 5 pm, and traffic may be reduced to one lane in each direction during construction. Call the project hotline at (626) 458-2507 with any questions or visit the project website at devilsgateproject.com.
Update: 1/23/20
Notice: Upcoming traffic signal improvements at Oak Grove Drive and Berkshire Place
LA County Public Works is dedicated to being a good neighbor and taking a community-first approach in its implementation of the Devil’s Gate Reservoir Restoration Project.
To enhance safety and improve traffic flow around the project site, traffic signal improvements will be performed at the intersection of Oak Grove Drive and Berkshire Place. Work includes upgrading the traffic signal to include a dedicated left turn arrow for traffic traveling northbound on Oak Grove Drive and turning westbound onto Berkshire Place. Work will begin as early as Monday, January 27, and last approximately seven weeks. Working hours are from 6 am – 2:30 pm to accommodate school pick up. Traffic may be reduced to one lane in each direction during working hours.
The project team thanks you for your patience.
Update: 11/15/19
Notice: Hauling has finished for the 2019 season and will resume in Spring 2020
LA County Public Works has completed its first year of sediment removal from Devil's Gate Reservoir and hauling operations have finished for the 2019 season. Sediment removal and hauling will resume in Spring 2020. Construction activities will continue onsite within the Reservoir through the end of November as the Contractor removes all of their equipment and prepares the Project site for the upcoming storm season.
Public Works appreciates everyone's support and cooperation throughout the sediment removal process. Your support truly made a difference to help protect residents and businesses downstream from potential flooding this storm season. We look forward to continuing to build relationships with the community as the Project progresses. Public Works wishes you and your families a wonderful holiday season!
The project team thanks you for your patience.
Update: 11/1/19
Notice: No Hauling this Friday, November 1, 2019
LA County Public Works appreciates the community’s patience with the Devil’s Gate Reservoir Restoration Project. There will be no hauling operations tomorrow, November 1, 2019. Hauling operations are anticipated to resume Monday, November 4.
The project team thanks you for your patience.
Update: 10/28/19
Notice: Notice: No Hauling this Monday, October 28, 2019 through Thursday, October 31, 2019
The National Weather Service has issued a Red Flag Warning for this Wednesday and Thursday due to gusty winds and very low humidity. A Red Flag Warning means that critical fire weather conditions are expected. There will be no hauling operations on Monday, October 28 through Thursday, October 31. Hauling operations are anticipated to resume on Friday, November 1.
The project team thanks you for your patience.
Update: 10/23/19
Notice: No Hauling this Thursday, October 24, 2019 and Friday, October 25, 2019
The National Weather Service has issued a Red Flag Warning for this Thursday and Friday due to gusty winds and very low humidity. A Red Flag Warning means that critical fire weather conditions are expected. Therefore, there will be no hauling operations on Thursday, October 24 and Friday, October 25. Hauling operations will resume Monday, October 28.
The project team thanks you for your patience.
Update: 10/9/19
Notice: No Hauling this Thursday, October 10, 2019 or Friday, October 11, 2019
The National Weather Service has issued a Red Flag Warning for this Thursday and Friday due to gusty winds and very low humidity. A Red Flag Warning means that critical fire weather conditions are expected. Therefore, there will be no hauling operations on Thursday, October 10 or Friday, October 11. Hauling operations will resume Monday, October 14.
The project team thanks you for your patience.
Update: 9/30/19
Notice: Hauling to resume Monday, September 30, 2019
LA County Public Works is dedicated to being a good neighbor and taking a community-first approach in its implementation of the Devil’s Gate Reservoir Restoration Project.
Due to dust and mud that was observed on the tires of trucks leaving the reservoir, Public Works took the proactive step of suspending hauling operations on September 5. To address these issues, a comprehensive plan was developed and implemented, which includes adding a second tire wash and other measures to significantly reduce the dust being tracked onto streets.
Hauling operations will resume Monday, September 30. Starting Monday, sediment will be hauled to Vulcan Materials Company’s Sheldon Pit in Sun Valley. Public Works will partner with the South Coast Air Quality Management District to closely monitor the streets to ensure all dust issues have been resolved.
We encourage community members to contact us immediately if they observe dust or have any other concerns regarding the hauling operation. Please contact us at (626) 458-2507 or the South Coast Air Quality Management District hotline at (800) CUT-SMOG.
The project team thanks you for your patience.
Update: 9/25/19
Notice: Public Works studies benefits of tarped haul trucks
LA County Public Works is dedicated to being a good neighbor and taking a community-first approach in its implementation of the Devil’s Gate Reservoir Restoration Project.
To determine the effectiveness of tarping all loaded haul trucks, Public Works initiated a pilot program that began August 19, 2019, in which both tarped and non-tarped trucks were followed and dust levels monitored and recorded. Results of the Tarping Pilot Program are available on the project website: Tarping Pilot Program Results.
Update: 9/12/19
Notice: Public Works studies benefits of tarped haul trucks
LA County Public Works is dedicated to being a good neighbor and taking a community-first approach in its implementation of the Devil’s Gate Reservoir Restoration Project.
To determine the effectiveness of tarping all loaded haul trucks, Public Works initiated a pilot program that began August 19, 2019, in which both tarped and non-tarped trucks were followed and dust levels monitored and recorded. Results of the Tarping Pilot Program are available on the project website: Tarping Pilot Program Results.
Update: 9/5/19
Notice: Hauling temporarily suspended due to ongoing dust issues
LA County Public Works is dedicated to being a good neighbor and taking a community-first approach in its implementation of the Devil’s Gate Reservoir Restoration Project. Although additional measures have been put in place to address dust and other issues, project managers are still observing dust on the tires of trucks exiting the work site. We are, therefore, suspending operations temporarily until a comprehensive plan to address dust has been developed and implemented.
The project team thanks you for your patience during this process.
Update: 8/29/19
Notice: No hauling this Friday, August 30, 2019 or next Monday, September 2, 2019
LA County Public Works appreciates the community’s patience with the Devil’s Gate Reservoir Restoration Project. In an effort to reduce traffic impacts leading into the holiday weekend, there will be no hauling operations on Friday, August 30 or Monday, September 2. Enjoy your long holiday weekend!
Update: 8/26/19
Notice: No hauling today, August 26, 2019, due to Brush Fire near the 134/2 Freeways
A brush fire broke out late Sunday afternoon in the Eagle Rock area resulting in a closure of portions of the 134 and 2 Freeways. As of 8 p.m. Sunday evening, spread of the fire was stopped in all directions with the size held to approximately 30 acres and containment at 25%. Due to the late start of the fire, unknown additional impacts, and the close proximity to the Devil’s Gate Reservoir Restoration Project site, LA County Public Works has determined there will be no hauling today, Monday, August 26, 2019. Public Works will continue to evaluate the status of the brush fire to determine when it is safe for hauling operations to resume.
For more information on the project, please visit the project website at DevilsGateProject.com, email Public Works at DevilsGateProject.com, email Public Works at devilsgateproject@dpw.lacounty.gov or call the Devil’s Gate Hotline at (626) 458-2507.
Update: 8/15/19
Notice: Temporary change to haul routes today due to signal outage at Oak Grove Dr. and Berkshire Pl.
At approximately 8:45 a.m. this morning, a power outage unrelated to the project caused the traffic signal at Oak Grove Drive and Berkshire Place to go out. Public Works notified the appropriate parties. Following the newly revised haul route schedule, effective today, haul trucks would have started traveling to Berkshire Place to get onto the 210 Freeway at 9 a.m. However, in an abundance of caution due to the signal at that intersection being non-operational, haul trucks continued to travel to Windsor Avenue for a short period of time until the signal at Berkshire Place was back up and confirmed to be operational. The haul trucks then switched to follow the approved route towards Berkshire Place.
For more information on the project, please visit the project website at DevilsGateProject.com, email Public Works at DevilsGateProject.com, email Public Works at devilsgateproject@dpw.lacounty.gov or call the Devil’s Gate Hotline at (626) 458-2507.
Update: 8/12/19
Notice: Tire wash installation begins today, August 12, 2019
Los Angeles County Public Works has started working today, August 12, 2019, on the installation of a tire wash at the haul truck exit of the Devil’s Gate Reservoir Restoration Project. This work, which has been approved by the City of Pasadena, includes constructing a temporary asphalt pavement extending from the newly constructed west access road to allow for the installation of a tire wash on a flat surface.
Utilizing a tire wash system at this location will remove dirt from the haul trucks’ tires and undercarriages before the trucks exit the project site, greatly reducing the amount of dirt tracked onto public roadways. After the haul trucks go through the tire wash, there will be a paved surface to allow the tires to dry before exiting the project site onto Oak Grove Drive. Implementing this additional measure in parallel with the other dust mitigation measures already employed on the project site will:
- Reduce or eliminate the amount of visible dust tracked onto the roadway.
- Further reduce the amount of airborne particulate matter from Project activities.
- Reduce the utilization of a water truck on the roadway.
- Reduce the frequency of street sweeping necessary, thereby extending the life of the existing pavement.
- Conserve water by utilizing recirculated water inside the tire wash system.
For more information on the project, please visit the project website at DevilsGateProject.com, email Public Works at DevilsGateProject.com, email Public Works at devilsgateproject@dpw.lacounty.gov or call the Devil’s Gate Hotline at (626) 458-2507.
Update: 8/7/19
Notice: New haul route schedule begins Thursday, August 15, 2019.
Beginning Thursday, August 15, LA County Public Works will transition to the newly adjusted In-School haul route:
- From 7 a.m. – 9 a.m., all haul trucks accessing the Project Site will exit the I-210 Freeway using Arroyo Blvd./Windsor Ave., turn left onto Oak Grove Dr. and enter the Project Site. All trucks hauling sediment away from the Project Site will travel on Oak Grove Dr. back to Windsor Ave. to enter the I-210 Freeway either eastbound to Irwindale or westbound to Sun Valley.
- From 9 a.m. – 2:30 p.m., all trucks accessing the Project Site will exit the I-210 Freeway using Arroyo Blvd./Windsor Ave., turn left onto Oak Grove Dr. and enter the Project Site. All trucks hauling sediment away from the Project Site will turn right onto Oak Grove Dr. to Berkshire Pl. to enter the I-210 Freeway either eastbound to Irwindale or westbound to Sun Valley.
- From 2:30 p.m. – 3:30 p.m., all haul trucks will follow the same route as the 7 a.m. – 9 a.m. period, exiting and entering the I-210 Freeway using Arroyo Blvd./Windsor Ave.
The In-School haul route avoids school traffic in the morning during drop-offs and in the afternoon during pick-ups. Together, the In-School and Summer haul routes balance truck traffic between the communities of Pasadena and Altadena on the east side of the reservoir and La Cañada Flintridge on the west side. An overview of the haul routes is shown in a video on the project website here. For more information on the project, please visit the project website at DevilsGateProject.com, email Public Works at DevilsGateProject.com, email Public Works at devilsgateproject@dpw.lacounty.gov or call the Devil’s Gate Hotline at (626) 458-2507.
Update: 6/6/19
Notice: Summer haul route begins Thursday June 6, 2019 and ends mid-August.
Beginning Thursday, June 6, LA County Public Works will transition to the Summer haul route with all haul trucks accessing the I-210 Freeway using Berkshire Place/Oak Grove Drive in La Cañada Flintridge. The Summer haul route will balance truck traffic between the communities of Pasadena and Altadena on the east side of the reservoir and La Cañada Flintridge on the west side. For more information on the project, please visit the project website at DevilsGateProject.com, email Public Works at DevilsGateProject.com, email Public Works at devilsgateproject@dpw.lacounty.gov or call the Devil’s Gate Hotline at (626) 458-2507.
Update: 5/24/19
Week 1 Update
Public Works began sediment removal at Devil’s Gate Reservoir on Tuesday May 21, 2019 with the goal of establishing a community-first construction plan that limits truck impacts, monitors air quality and engages community stakeholders.
To date, up to 63 trucks have made over 1,000 trips, removing more than 12,500 cubic yards of sediment.
South Coast Air Quality Management District inspectors have been on-site and results from the six air quality monitors have been good. The air quality reports are available for public review at Devilsgateproject.com.
Representatives from the cities of La Cañada, Pasadena and the community of Altadena have been monitoring the project site and are providing feedback on issues concerning fugitive dust. Public Works is monitoring and addressing fugitive dust and has added additional street sweepers and water trucks.
Public Works also plans to host a series of "check in" meetings with cities, schools, and community organizations next week to recap the first week of operations and address any concerns.
For more information, please visit the project website at DevilsGateProject.com, email Public Works at devilsgateproject@dpw.lacounty.gov or call the Devil’s Gate Hotline at (626) 458-2507.
Update: 5/20/19
Notice: Sediment removal at Devil’s Gate Reservoir to begin on Tuesday, May 21, 2019, weather permitting.
Weather forecasts predict light rainfall tomorrow that should not impact operations. LA County Public Works will continue to monitor the weather and provide updates as they become available. For more information on the project, please visit the project website at DevilsGateProject.com, email Public Works at devilsgateproject@dpw.lacounty.gov or call the Devil’s Gate Hotline at (626) 458-2507.
Update: 5/19/19
Due to an updated weather forecast predicting rain throughout Sunday evening, the start of hauling for the Devil’s Gate Reservoir Restoration Project has been postponed until at least Tuesday morning. LA County Public Works will continue to monitor the weather and provide updates as they become available.
UPDATE: 5/17/19
Notice: Sediment removal at Devil’s Gate Reservoir to begin on Monday, May 20, 2019, weather permitting.
Los Angeles County Public Works has been actively planning for a more sustainable Devil's Gate Reservoir. To achieve balance between restoring flood protection to downstream communities and preserving the natural resources of the Hahamongna Watershed, Public Works will remove 1.7 million cubic yards of sediment over 4 years from the reservoir behind Devil’s Gate Dam. In addition to providing flood relief to downstream communities that have endured nearly a decade of elevated flood risk, the restoration project will create over 70 acres of enhanced habitat for wildlife.
Public Works is currently working with the South Coast Air Quality Management District (AQMD) and the California Air Resources Board (CARB) on installing air quality monitors around the project site; all air quality monitors will be installed and operational before trucking activity begins. Additionally, trucks used to haul sediment are undergoing tests and results show trucking activity will contribute less than 0.6% of daily local NOx emissions, 0.2% of daily local PM10 emissions, and 0.4% of daily local PM2.5 emissions. Public Works also recently retested the sediment in the reservoir and found it was non-hazardous and had no traces of Glyphosate (Roundup).
For more information on the project, please visit the project website at DevilsGateProject.com, email Public Works at devilsgateproject@pw.lacounty.gov or call the Devil’s Gate Project Hotline at (626) 458-2507.
Update: 5/15/19
Los Angeles County Public Works is working to provide the community with the most current and accurate information as it becomes available. A number of new documents have been recently uploaded onto the project website ( devilsgateproject.com ), under Resources. Many of these are living documents, and will be updated as more information becomes available and the project progresses. We encourage the community to explore the project website and resources available and let us know if you have any comments or questions.
Update: 2/20/19
Storm Debris Removal at Devils Gate Reservoir
MAINTENANCE ACTIVITY
Los Angeles County Public Works is removing recent storm debris from Devils Gate Reservoir. This is routine facility maintenance and not part of the Devils Gate Reservoir Restoration Project. The debris removal is necessary to safeguard downstream communities by maintaining operability of Devils Gate Dam and maximize storage capacity in the reservoir. Once removed, this debris will be transported to Scholl Canyon Landfill in the City of Glendale.
DATE/TIME
County crews will begin hauling on Wednesday, February 20, 2019. Hauling operations will be limited to 7:00 a.m. to 3:30 p.m., Monday through Friday, for approximately 2 weeks. Additional debris removal work inside the reservoir may take place on weekends.
RESIDENT SUPPORT
LA County appreciates your patience and understanding during storm season. If you have questions about maintenance activities or would like to report a concern, contact Public Works Dispatch at (800) 675-HELP (4357).
Update: 11/26/18
Los Angeles County Public Works has been actively planning for a more sustainable Devil's Gate Reservoir. In an effort to achieve balance between restoring flood protection to downstream communities and preserving the natural resources of the Hahamongna Watershed, Public Works will remove 1.7 million cubic yards of sediment over 4 years from the reservoir behind Devil’s Gate Dam. In addition to providing flood relief to downstream communities that have endured nearly a decade of elevated flood risk, the restoration project will create over 70 acres of enhanced habitat for wildlife.
Habitat restoration activities have already started on the perimeter of the reservoir with the removal of non-native and invasive plant species within the Habitat Restoration Areas. In an effort to minimize the impact to the community, LA County Public Works in coordination with the Contractor, Griffith Company, are waiting to start initial construction activities until after the Thanksgiving holiday. Initial construction activities include vegetation removal from within the sediment excavation footprint and access road construction, with the sediment removal and hauling starting in April 2019. Starting the week of November 26, 2018, you will see equipment on-site and construction activities beginning, trails will be temporarily closed during weekdays, but open on the weekends. For more information you can view the Project Fact Sheet here.
Update: 10/9/18
LA County Public Works is prepared to start work on the Devil's Gate Reservoir Restoration Project within the upcoming month. The first phase of the Project involves the restoration of over 70 acres of invasive vegetation with native habitat.
