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Water-Year Summary for Site 11276600

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

Water year 2019: 2019-10-01 to 2020-09-30
 

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USGS Water-Year Summary 2019
11276600 Tuolumne River above Early Intake, near Mather, CA
LOCATION - Lat 37°52'46", long 119°56'46" referenced to North American Datum of 1927, in SE 1/4 SW 1/4 sec.01, T.1 S., R.18 E., Tuolumne County, CA, Hydrologic Unit 18040009, in Stanislaus National Forest, on right bank, 0.5 mile upstream from Early Intake, 2.4 miles upstream from Cherry Creek, and 5.0 miles west of Mather.
DRAINAGE AREA - 484 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1970 to current year.
GAGE - Water-stage recorder. Elevation of gage is 2,420 ft above NGVD of 1929, from topographic map. Prior to Sept. 5, 2007, at site on left bank.
REMARKS - Flow regulated by Hetch Hetchy Reservoir (station 11275500) 12 mi upstream. Flow diverted upstream from station through tunnel to Robert C. Kirkwood Powerplant and Hetch Hetchy Aqueduct. See schematic diagram of Tuolumne River Basin available from the California Water Science Center.
EXTREMES OUTSIDE PERIOD OF RECORD - Flood of June 1, 1943, reached a stage of 22.1 ft, discharge, 12,900 ft³/s.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 17,700 ft³/s, Jan. 3, 1997, gage height, 22.98 ft; minimum daily, 25 ft³/s, Oct. 11, 1988.
WATER-QUALITY RECORDS
PERIOD OF DAILY RECORD - October 1971 to June 1972, August 1987 to current year. WATER TEMPERATURE: October 1971 to June 1972, August 1987 to current year.
INSTRUMENTATION - Water-temperature recorder October 1971 to June 1972, and since Aug. 12, 1987. Prior to Sept. 5, 2007, at site 600 ft upstream.
REMARKS -  
EXTREMES FOR PERIOD OF DAILY RECORD - WATER TEMPERATURE: Maximum recorded, 26.3°C, July 2, 3, 2014; minimum recorded, 0.0°C, several days in January 1972, Dec. 24, 25, 1990.