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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
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USGS Water-Year Summary 2024
11020600 El Capitan Lake near Lakeside, CA
LOCATION - Lat 32°52'56", long 116°48'30" referenced to North American Datum of 1927, in SE 1/4 NE 1/4 sec.07, T.15 S., R.2 E., San Diego County, CA, Hydrologic Unit 18070304, on left bank, 100 ft upstream from El Capitan Dam on San Diego River, and 7.0 mi east of Lakeside.
DRAINAGE AREA - 188 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1936 to September 1966 (published with San Diego River at El Capitan Dam, station 11020500), October 1972 to September 1993, March 2004 to current year. Monthend contents only October 1972 to September 1987. October 1936 to September 1945, published in WSP 1315-B, not equivalent due to exclusion of greater part of flow released from Cuyamaca Reservoir.
GAGE - Water-stage recorder. Datum of gage is NGVD of 1929 and 2.16 ft above NAVD of 1988. Prior to October 1987, nonrecording gage at same site.
REMARKS - Reservoir is formed by hydraulic fill-rock embankment, completed in 1935. Capacity of reservoir at spillway level, 112,810 acre-ft, elevation, 750.00 ft. Dead storage below lowest outlet, 59 acre-ft, elevation, 574.00 ft. Reservoir storage includes supplemental Colorado River water. No significant diversion upstream from reservoir. Inflow partly regulated by Cuyamaca Reservoir, capacity, 11,740 acre-ft. Water is released as required for municipal use and irrigation. See schematic diagram of the San Diego River Basin available from the California Water Science Center.
EXTREMES FOR PERIOD OF RECORD - Maximum contents observed, 114,500 acre-ft, spilling, Mar. 7, 1980, elevation, 751.09 ft; minimum observed, 2,252 acre-ft, May 1, 1957, elevation, 606.28 ft.
Capacity table (elevation, in feet, and contents, in acre-feet) (Based on table dated May 25, 1956) Elevation Contents Elevation Contents Elevation Contents Elevation Contents 600 1,450 630 7,820 660 20,650 720 71,790 610 2,820 640 11,310 680 33,780 740 97,790 620 4,940 650 15,530 700 50,730 753 117,550
