USGS Water-Year Summary 2023
11433300 Middle Fork American River near Foresthill, CA
LOCATION - Lat 39°00'22", long 120°45'35" referenced to North American Datum of 1927, in NW 1/4 NW 1/4 sec.04, T.13 N., R.11 E., Placer County, CA, Hydrologic Unit 18020128, in Tahoe National Forest, on right bank, 1.6 mi downstream from Oxbow Powerplant, 2.0 mi upstream from Mad Canyon, and 3.3 mi east of Foresthill.
DRAINAGE AREA - 524 mi².
REVISIONS HISTORY - WDR CA-03-4: 2000 (instantaneous maximum discharge).
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1958 to current year.
CHEMICAL DATA: Water year 1979.
BIOLOGICAL DATA: Water year 1979.
GAGE - Water-stage recorder. Elevation of gage is 1,070 ft above NGVD of 1929, from topographic map. Prior to Oct. 22, 1965, at site 3.2 mi downstream at different datum. Oct. 22, 1965, to Aug. 28, 1985, at site 400 ft downstream at different datum.
COOPERATION - Records, including diversion through Oxbow Powerplant (station 11433212) through the 2013 water year, provided by Placer County Water Agency, under general supervision of the U.S. Geological Survey, in connection with Federal Energy Regulatory Commission project no. 2079.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 310,000 ft³/s, Dec. 23, 1964, gage height, 69.0 ft, from floodmarks, site and datum then in use, caused by overtopping of the partly constructed Hell Hole Dam on the Rubicon River, from rating curve extended above 28,000 ft³/s, on basis of slope-area measurement at gage height 38.0 ft and slope-conveyance study at gage height 69.0 ft, at site and datum then in use; next highest peak, 123,000 ft³/s, Jan. 2, 1997, gage height, 29.56 ft, from rating curve extended above 37,000 ft³/s; minimum, 35 ft³/s, Oct. 10-20, 1961.