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USGS Water-Year Summary 2024
10336608 Echo Lake near Phillips, CA
LOCATION - Lat 38°50'05", long 120°02'36" referenced to North American Datum of 1927, in NE 1/4 NE 1/4 sec.01, T.11 N., R.17 E., El Dorado County, CA, Hydrologic Unit 16050101, Eldorado National Forest, on wall at right end of dam on Lower Echo Lake, near valve outlet to Echo Lake Conduit, and 2.0 mi northeast of Phillips.
DRAINAGE AREA - 4.84 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1991 to current year. Unpublished records for 1981-91 water years are available in files of the U.S. Geological Survey.
GAGE - Water-stage recorder. Prior to Dec. 3, 1991, nonrecording gage read periodically. Elevation of gage is 7,414 ft above NGVD of 1929, from topographic map.
COOPERATION - Records were collected by El Dorado Irrigation District, under general supervision of the U.S. Geological Survey, in connection with Federal Energy Regulatory Commission project no. 184.
REMARKS - Record not computed for the winter months. Reservoir is formed by concrete dam completed in 1922 and rebuilt in 1992; storage began in 1922. Contents based on capacity table dated 2000. Usable capacity, 1,890 acre-ft, between gage heights 0.0 ft, spillway crest, and 6.0 ft, top of flashboards. Water is released via Echo Lake Conduit to the South Fork American River for power and domestic use. Records from Dec. 3, 1991, including extremes, represent usable contents at 2400 hours. Monthly release through Echo Lake Conduit provided by El Dorado Irrigation District. See schematic diagrams of Truckee River Basin and South Fork American River Basin available from the California Water Science Center.
