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USGS Water-Year Summary 2024
11266500 Merced River at Pohono Bridge, near Yosemite, CA
LOCATION - Lat 37°42'58.60", long 119°39'56.40" referenced to North American Datum of 1983, Mariposa County, CA, Hydrologic Unit 18040008, unsurveyed, in Yosemite National Park, on left bank, 150 ft upstream from Pohono Bridge, 0.4 mi upstream from Artist Creek, and 4.8 mi southwest of Yosemite National Park Headquarters.
DRAINAGE AREA - 321 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1916 to current year. Monthly discharge only for October and November 1916, published in WSP 1315-A.
CHEMICAL DATA: Water years 1971-72, 1981-82, 1994, 1995.
WATER TEMPERATURE: Water year 1995.
SEDIMENT DATA: Water year 1995.
GAGE - Water-stage recorder. Datum of gage is 3864.88 ft above NAVD of 1988. Prior to Sept. 5, 1918, at datum 1.8 ft higher. Sept. 5, 1918, to Sept. 30, 1955, at datum 1.0 ft higher.
REMARKS - No diversions between stations at Happy Isles Bridge and Pohono Bridge.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 24,600 ft³/s, Jan. 3, 1997, gage height, 23.43 ft, from floodmarks in gagehouse, from rating curve extended above 17,000 ft³/s, on basis of computation of flow over diversion dam for Yosemite Powerplant 1 mi downstream at gage heights 20.1 and 21.98 ft; minimum daily, 5.4 ft³/s, Oct. 26, 1977.
