USGS Water-Year Summary 2018
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).
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.