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Water-Year Summary for Site 11292800

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Available Parameters
00054 Reservoir storage(Obs.)  

Water year 2023: 2022-10-01 to 2023-09-30
 
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USGS Water-Year Summary 2023
11292800 Beardsley Lake near Strawberry, CA
LOCATION - Lat 38°12'17", long 120°04'31" referenced to North American Datum of 1927, in SE 1/4 NW 1/4 sec.14, T.4 N., R.17 E., Tuolumne County, CA, Hydrologic Unit 18040010, in Stanislaus National Forest, in hoist house of Beardsley Dam on Middle Fork Stanislaus River, 2.4 mi upstream from Spring Gap Powerplant, 3.9 mi west of Strawberry, and 4.7 mi west of Pinecrest.
DRAINAGE AREA - 309 mi².
REVISIONS HISTORY - WSP 1930: Drainage area.
SURFACE-WATER RECORDS
PERIOD OF RECORD - June 1957 to September 2006, and October 2007 to current year. Prior to October 1960, published as "Lake Hartley near Strawberry."
GAGE - Water-stage recorder. Datum of gage is 7.84 ft above NGVD of 1929 and 10.63 ft above NAVD of 1988.
REMARKS - Reservoir is formed by rock-fill, earth-core dam completed in 1957. Capacity, 98,500 acre-ft, between gage heights 3,145.0 ft, tunnel invert, and 3,398.0 ft, top of spillway gates. Contents based on capacity table no. 1, dated Oct. 3, 1956. No dead storage. Reservoir is used for power and conservation storage. Water passes through Beardsley Powerplant, is diverted at Beardsley Afterbay to J.W. Southern Powerplant at Sand Bar Flat on the Middle Fork Stanislaus River, and then diverted to Stanislaus Powerplant at the head of New Melones Reservoir (station 11299000). Records represent total contents at 2400 hours. Records collected in connection with Federal Energy Regulatory Commission (FERC) project no. 2005. See schematic diagram of Stanislaus River Basin available from the California Water Science Center.
EXTREMES FOR PERIOD OF RECORD - Prior to Oct. 1, 2008, maximum contents at 2400 hours, 98,700 acre-ft, June 27, 1957, gage height, 3,398.2 ft; minimum since reservoir first filled, 3 acre-ft, Sept. 23, 1976, gage height, 3,154.4 ft. Since Oct. 1, 2008, maximum contents, 97,700 acre-ft, June 6, 11, 12, 2009, maximum elevation, 3,396.85 ft, June 11, 12, 2009.