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Water-Year Summary for Site 11427770

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Available Parameters
00060 Discharge(Mean)  

Water year 2023: 2022-10-01 to 2023-09-30
 
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USGS Water-Year Summary 2023
11427770 Middle Fork American River below Interbay Dam, near Foresthill, CA
LOCATION - Lat 39°01'35", long 120°36'09" referenced to North American Datum of 1927, in SW 1/4 SE 1/4 sec.26, T.14 N., R.12 E., Placer County, CA, Hydrologic Unit 18020128, in Tahoe National Forest, on left bank at Interbay Dam, 3.3 mi upstream from Big Mosquito Creek, and 10.6 mi east of Foresthill.
DRAINAGE AREA - 89.1 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1965 to December 2002, January 2005 to current year (since October 1985, operated as low-flow station only).
GAGE - Acoustic-velocity meter system. Elevation of gage is 2,470 ft above NGVD of 1929, from topographic map. Prior to February 1986, water-stage recorder at same site. March 1986 to September 1987, nonrecording gage and V-notch sharp-crested weir at same site and datum as previous gage.
COOPERATION - Records, including diversion through Ralston Powerplant (station 11427765) 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.
REMARKS - Flow regulated by French Meadows Reservoir (station 11427400) and after Aug. 22, 1966, by Interbay Reservoir (usable capacity, 130 acre-ft, between normal operating limits) 500 ft upstream. Water is diverted out of the basin from French Meadows Reservoir to Hell Hole Reservoir (station 11428700) and from Interbay Reservoir to Ralston Powerplant. Water is diverted into the basin from Hell Hole Reservoir to Middle Fork Powerplant (station 11428600) and through South Fork and North Fork Long Canyon Creek Diversion Tunnels (stations 11433060 and 11433080). Beginning October 1985, only flows less than 35 ft³/s are computed. Gage non-operational from January 2003 through December 2004. See schematic diagram of Middle Fork American and Rubicon River Basins available from the California Water Science Center.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge (water years 1966-85), 9,900 ft³/s, Jan. 13, 1980, gage height, 7.95 ft; minimum daily, 1.0 ft³/s, Oct. 25-30, 1966, Jan. 19, 1967.