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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
11435100 Pyramid Creek at Twin Bridges, CA
LOCATION - Lat 38°48'57", long 120°06'58" referenced to North American Datum of 1927, in NW 1/4 SW 1/4 sec.09, T.11 N., R.17 E., El Dorado County, CA, Hydrologic Unit 18020129, Eldorado National Forest, on right bank, 0.5 mi northeast of Twin Bridges, 2.2 mi west of Phillips, and 3.6 mi downstream from Lake Aloha.
DRAINAGE AREA - 8.76 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1970 to current year.
GAGE - Water-stage recorder. Elevation of gage is 6,320 ft above NGVD of 1929, from topographic map. Prior to October 1987, at datum 1.00 ft higher.
COOPERATION - Records were collected by the El Dorado Irrigation District, under general supervision of the U.S. Geological Survey, in connection with Federal Energy Regulatory Commission project no. 184.
REMARKS - Flow regulated by Lake Aloha, capacity, 5,000 acre-ft. Lake of the Woods, Ropi Lake, and Toem Lake (unknown capacities) also regulate at times. See schematic diagram of South Fork American River Basin available from the California Water Science Center.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 2,920 ft³/s, Jan. 2, 1997, gage height, 7.22 ft, from rating curve extended above 300 ft³/s; minimum daily, 0.03 ft³/s, Oct. 26-28, 1992.
