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Water-Year Summary for Site 11297700

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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
11297700 Lyons Reservoir near Long Barn, CA
LOCATION - Lat 38°05'38", long 120°09'59" referenced to North American Datum of 1927, in SW 1/4 NE 1/4 sec.24, T.3 N., R.16 E., Tuolumne County, CA, Hydrologic Unit 18040010, at left abutment of dam, and 1.6 mi west of Long Barn.
DRAINAGE AREA - 66.8 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1985 to current year. Unpublished records for water years 1981-85 are available in files of the U.S. Geological Survey.
GAGE - Water-stage recorder. Prior to Dec. 10, 1990, nonrecording gage read three times weekly. Datum of gage is 4,134 ft above NGVD of 1929 (levels by Pacific Gas and Electric Company).
COOPERATION - Records were collected by Pacific Gas and Electric Company, under general supervision of the U.S. Geological Survey, in connection with Federal Energy Regulatory Commission project no. 2130.
REMARKS - Reservoir is formed by concrete arch dam completed in 1930; storage began in 1930. Contents based on capacity table dated 1996. Usable capacity, 4,850 acre-ft, between gage heights 0.0 ft, invert of outlet, and 86.0 ft, top of spillway gates. Dead storage, 2.5 acre-ft. Part of the released water is diverted to Tuolumne Canal (station 11297500) near the base of the dam. Records since Dec. 10, 1990, including extremes, represent total contents at 2400 hours. See schematic diagram of Stanislaus River Basin available from the California Water Science Center.
EXTREMES FOR PERIOD OF RECORD - Maximum contents observed, 6,292 acre-ft, June 4, 5, 7, 9, 10, 1989, gage height, 90.4 ft, maximum gage height, 90.47 ft, June 15, 2000; minimum, 829 acre-ft, Dec. 21, 2006, gage height, 48.44 ft.