USGS Water-Year Summary 2021
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.
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.
PERIOD OF RECORD
DISCRETE WATER-QUALITY DATA:
CHEMICAL DATA: Water years 2015-16.
CONTINUOUS WATER-QUALITY DATA:
SPECIFIC CONDUCTANCE: Water years October 2007 to current year.
WATER TEMPERATURE: Water years October 2006 to current year.
TURBIDITY: Water years October 2006 to current year.
INSTRUMENTATION - Water quality monitor since October 2006.