LOCATION: On the left (southeast) bank approximately 400 feet below the old toe wall on the downstream side of Big Dalton Dam and approximately 5 miles northeast of City of Glendora. Elevation of zero gage height is 1539.63 feet.
REGULATION: 4.5 square miles regulated by Big Dalton Dam. 0.3 square miles unregulated flow from Keril Canyon.
CHANNEL: Sand and gravel, natural section.
CONTROL: Concrete stabilizer.
LENGTH OF RECORD: Reservoir outflow records from October 1929 to June 3, 1940, recorder records from June 3, 1940 to September 30, 1955, from October 1, 1955 to date.