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Water-Year Summary for Site 11230530

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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
11230530 Bear Creek below Diversion Dam, near Lake Thomas A. Edison, CA
LOCATION - Lat 37°20'08", long 118°58'29" referenced to North American Datum of 1927, Fresno County, CA, Hydrologic Unit 18040006, unsurveyed, in Sierra National Forest, on right bank, 60 ft downstream from diversion dam, 2.5 mi south of Lake Thomas A. Edison, and 18.3 mi east of town of Big Creek.
DRAINAGE AREA - 52.8 mi².
PERIOD OF RECORD - October 1986 to current year. Prior to October 1991, published as "at diversion dam."
GAGE - Acoustic-velocity meter on low-flow discharge, and water-stage recorder on diversion reservoir. Datum of gage is 7,338.30 ft above NGVD of 1929 (levels by Southern California Edison Co.).
COOPERATION - Records were collected by Southern California Edison Co., under general supervision of the U.S. Geological Survey, in connection with Federal Energy Regulatory Commission project nos. 67 and 120.
REMARKS - Low and medium flow regulated at diversion dam. Most of the flow is diverted at the diversion dam to Bear Creek Conduit (station 11230520), then to Ward Tunnel and Huntington Lake (station 11236000) via Portal Powerplant (station 11235500) for further power development in Big Creek powerplants. See schematic diagram of upper San Joaquin River Basin available from the California Water Science Center.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 1,730 ft³/s, July 9, 1995, gage height, 14.75 ft; minimum daily, 0.94 ft³/s, Oct. 15, 1987.