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Water-Year Summary for Site 11229600

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Available Parameters
00054 Reservoir storage(Obs.)  

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

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USGS Water-Year Summary 2021
11229600 Florence Lake near Big Creek, CA
LOCATION - Lat 37°16'20", long 118°58'17" referenced to North American Datum of 1927, Fresno County, CA, Hydrologic Unit 18040006, unsurveyed, in Sierra National Forest, in gatehouse of Ward Tunnel intake, 0.3 mi west of dam on South Fork San Joaquin River, and 16 mi northeast of town of Big Creek.
DRAINAGE AREA - 171 mi².
REVISIONS HISTORY - WDR CA-78-3: 1977; WDR CA-02-3: 2001, Extremes for current year.
PERIOD OF RECORD - November 1925 to current year. Prior to October 1931, published in WSP 721. Maximum and minimum daily contents (water years 1926-39) summarized in WSP 881. Prior to 1960, maximum and minimum daily contents were published.
GAGE - Water-stage recorder. Datum of gage is 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. Contents not rounded to U.S. Geological Survey standards.
REMARKS - Lake is formed by multiple-arch concrete dam; storage began in April 1925. Contents based on capacity table dated Aug. 26, 1926. Usable capacity, 64,406 acre-ft, between elevations 7,220.94 ft, throat of Venturi tube in Ward Tunnel intake (station 11229500), and 7,327.50 ft, top of spillway drum gates. Additional storage of 168 acre-ft is not available for diversion. Water is diverted through Ward Tunnel to Huntington Lake (station 11236000) via Portal Powerplant (station 11235500) and used for further power development in Big Creek powerplants. Records, excluding extremes, represent contents at 2400 hours. See schematic diagram of upper San Joaquin River Basin available from the California Water Science Center.
EXTREMES FOR PERIOD OF RECORD - Maximum contents, 65,990 acre-ft, July 3, 1932, elevation, 7,329.14 ft; minimum occurred during period of no record, Oct. 2-4, 1926, or Nov. 30 to Dec. 2, 1927.