USGS Water-Year Summary for Site 11278000

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	Available Parameters
	00010 Temperature, water(Mean,Max.,Min.)
	00060 Discharge(Mean)

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Water year 2023: 2022-10-01 to 2023-09-30

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USGS Water-Year Summary 2023

11278000 Eleanor Creek near Hetch Hetchy, CA

LOCATION - Lat 37°58'09", long 119°52'52" referenced to North American Datum of 1927, in NW 1/4 SW 1/4 sec.03, T.1 N., R.19 E., Tuolumne County, CA, Hydrologic Unit 18040009, Yosemite National Park, on right bank, 0.5 mi downstream from Lake Eleanor Dam, 1.1 mi upstream from Miguel Creek, 5.5 mi northwest of Hetch Hetchy, and 6.2 mi northwest of Mather.

DRAINAGE AREA - 78.4 mi².

REVISIONS HISTORY - WSP 1315-A: 1923 (instantaneous maximum discharge). WSP 1930: Drainage area. WDR-US-2006: 2005 (instantaneous maximum discharge).

SURFACE-WATER RECORDS

PERIOD OF RECORD - October 1909 to current year. Monthly discharge only for some periods, published in WSP 1315-A. Published as "near Sequoia" 1910-18.

GAGE - Water-stage recorder. Elevation of gage is 4,500 ft above NGVD of 1929, from topographic map. November 1909 to November 1915, nonrecording gage and water-stage recorder at site 1 mi upstream at different datum. Prior to Jan. 2, 1997, datum of gage 10 ft higher.

REMARKS - Flow regulated by Lake Eleanor (station 11277500) 0.5 mi upstream beginning in 1918. Since March 1960, water is diverted at Lake Eleanor via Lake Eleanor diversion tunnel (station 11277100) to Cherry Lake (station 11277200). See schematic diagram of Tuolumne River Basin available from the California Water Science Center.

EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 19,500 ft³/s, Jan. 2, 1997, gage height, 26.74 ft, from rating curve extended above 2,600 ft³/s, on basis of slope-area measurements at gage heights 9.94 and 12.24 ft, datum then in use; no flow at times in 1910, 1930-31, 1933, 1956.

WATER-QUALITY RECORDS

PERIOD OF RECORD -

CONTINUOUS WATER-QUALITY DATA:
WATER TEMPERATURE: Water years April 2006 to current year (water years 2006-2023, daily).

INSTRUMENTATION - Water-temperature recorder since Apr. 26, 2006.

REMARKS -

The practice of assigning qualitative accuracy ratings to water-quality data was discontinued in the 2017 water year.