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Water-Year Summary for Site USGS 11277500

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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
11277500 Lake Eleanor near Hetch Hetchy, CA
LOCATION - Lat 37°58'27", long 119°52'48" referenced to North American Datum of 1927, in SE 1/4 NW 1/4 sec.03, T.1 N., R.19 E., Tuolumne County, CA, Hydrologic Unit 18040009, Yosemite National Park, 710 ft from left bank on upstream side of dam on Eleanor Creek, 1.7 mi upstream from Miguel Creek, and 5.5 mi northwest of Hetch Hetchy.
DRAINAGE AREA - 78.1 mi².
REVISIONS HISTORY - WSP 1445: 1938 (instantaneous maximum discharge). WSP 1930: Drainage area.
SURFACE-WATER RECORDS
PERIOD OF RECORD - June 1918 to current year. Prior to October 1930, published in WSP 1315-A. Published as "near Sequoia" 1919-20.
GAGE - Water-stage recorder. Datum of gage is 2.39 ft above NGVD of 1929 and 5.78 ft above NAVD of 1988. Prior to Oct. 1, 1927, nonrecording gage on upstream side of dam at same site and datum.
REMARKS - Reservoir is formed by multiple-arch dam completed in 1918; storage began June 23, 1918. Usable capacity, 26,100 acre-ft, between gage heights 4,620.9 ft, natural outlet of old lake, and 4,660.0 ft, top of 5-ft flashboards. Dead storage, 39 acre-ft. Records, excluding extremes, represent usable contents at 2400 hours. See schematic diagram of Tuolumne River Basin available from the California Water Science Center.
EXTREMES FOR PERIOD OF RECORD - Maximum contents, 31,000 acre-ft, Dec. 11, 1937, from capacity table then in use, gage height, 4,663.4 ft, maximum gage height, 4,663.87 ft, Jan. 1, 1997; no usable contents at times in many years.