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Water-Year Summary for Site 11274790

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  • Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
  • For water years 2014 onward, choose a water year and parameter and an on-demand Water-Year Summary report will be generated.
  • For water years 2006 through 2013, choose a water year and an Annual Water Data Report will be provided.
  • For water years 2005 and earlier, Annual Water Data Reports may be available in digital format.
  • Not all sites have reports available for every water year.
Available Parameters
00010 Temperature, water(Mean,Max.,Min.)  
00060 Discharge(Mean)  
00095 Specific cond at 25C(Mean,Max.,Min.)  
63680 Turbidity, Form Neph(Med.,Max.,Min.)  
63680 Turbidity, Form Neph(Max.,Min.,Med.) [YSI EXO]  

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

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USGS Water-Year Summary 2023
11274790 Tuolumne River at Grand Canyon of Tuolumne, above Hetch Hetchy, CA
LOCATION - Lat 37°55'00", long 119°39'32" referenced to North American Datum of 1927, Tuolumne County, CA, Hydrologic Unit 18040009, in Yosemite National Park, on right bank, 7.8 mi southeast of O'Shaughnessy Dam at Hetch Hetchy, and 3.4 mi north of White Wolf.
DRAINAGE AREA - 301 mi².
PERIOD OF RECORD - October 2006 to current year.
GAGE - Water-stage recorder, crest-stage gage since Oct. 12, 2006. Elevation of gage is 3,830 ft above NGVD of 1929, from topographic map.
REMARKS - See schematic diagram of Tuolumne River Basin available from California Water Science Center.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 7,060 ft³/s, June 8, 2010, gage height, 20.83 ft; minimum discharge, 4.1 ft³/s, Jan. 17, 2012, gage height, 6.57 ft.

CHEMICAL DATA: Water years 2015-16.

SPECIFIC CONDUCTANCE: Water years October 2007 to current year. (water years 2008-2023, daily).
WATER TEMPERATURE: Water years October 2006 to current year. (water years 2007-2023, daily).
TURBIDITY: Water years October 2006 to current year. (water years 2007-2023, daily).

INSTRUMENTATION - Water quality monitor since October 2006.
REMARKS - The practice of assigning qualitative accuracy rating to water-quality data was discontinued in water year 2017.