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Water-Year Summary for Site USGS 11427000

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Available Parameters
00060 Discharge(Mean)  

Water year 2021: 2020-10-01 to 2021-09-30

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USGS Water-Year Summary 2021
11427000 North Fork American River at North Fork Dam, CA
LOCATION - Lat 38°56'10", long 121°01'22" referenced to North American Datum of 1927, in SW 1/4 NW 1/4 sec.31, T.13 N., R.9 E., Placer County, CA, Hydrologic Unit 18020128, on left bank, 50 ft upstream from crest of North Fork Dam, 2 mi upstream from Middle Fork American River, and 4 mi northeast of Auburn.
DRAINAGE AREA - 342 mi².
PERIOD OF RECORD - October 1941 to current year. CHEMICAL DATA: Water years 1977-80. WATER TEMPERATURE: Water years 1960-83. SEDIMENT DATA: Water year 1980 (periodic record).
REVISED RECORDS - WSP 1931: Drainage area.
GAGE - Water-stage recorder and ogee section of concrete debris dam. Datum of gage is 715.00 ft above NGVD of 1929 (levels by U.S. Army Corps of Engineers).
REMARKS - Records rated fair except for estimated daily discharges, which are poor. Minor regulation by Lake Clementine, usable capacity, 12,800 acre-ft., formed by North Fork Dam. Storage in Big Reservoir and Lake Valley Reservoir (station 11426170), combined capacity, 10,300 acre-ft, upstream from station. Lake Valley Canal (station 11426190) diverts from North Fork of American River into Bear River Basin for power development in powerplants of Pacific Gas and Electric Co. Combined storage and diversion have small effect on natural flow. See schematic diagrams of Bear River Basin and lower Sacramento River Basin available from the California Water Science Center.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 65,400 ft³/s, Dec. 23, 1964, gage height, 11.87 ft, from rating curve extended above 24,000 ft³/s, on basis of computed flow over crest of dam at gage height 10.22 ft; no flow Aug. 27-30, Sept. 2-11, 1944, Oct. 5, 6, 1963, Nov. 7-10, 1965, Nov.5, 10-12, 2014, caused by operation of valve in North Fork Dam.