USGS Water-Year Summary for Site 11285500

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	Available Parameters
	00010 Temperature, water(Max.,Min.,Med.)
	00060 Discharge(Mean)
	00095 Specific cond at 25C(Min.,Max.,Med.)
	00300 Dissolved oxygen(Max.,Min.,Med.)
	00400 pH(Min.,Max.,Med.)
	63680 Turbidity, Form Neph(Max.,Med.,Min.)

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Water year 2024: 2024-10-01 to 2025-09-30

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USGS Water-Year Summary 2024

11285500 TUOLUMNE RIVER AT WARDS FERRY BRIDGE NEAR GROVELAND, CA

LOCATION - Lat 37°52'42", long 120°17'41" referenced to North American Datum of 1983, in SE 1/4 NW 1/4 sec.02, T.1 S., R.15 E., Tuolumne County, CA, Hydrologic Unit 18040009, on right bank, 300 ft upstream of Wards Ferry Road bridge, and 4.4 mi northwest of Groveland.

DRAINAGE AREA - 1,267 mi².

SURFACE-WATER RECORDS

PERIOD OF RECORD - December 5, 2013 to December 19, 2016 (discontinued).

GAGE - Water-stage recorder. Elevation of gage is 760 ft above NGVD of 1929, from topographic map.

REMARKS - Flow regulated by Hetch Hetchy Reservoir (11275500) and Robert C. Kirkwood Powerplant, Cherry Lake (11277200), Lake Eleanor (11277500), and Dion R. Holm Powerhouse.

EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 20,500 ft³/s, March 6, 2016, gage height, 20.93 ft; minimum daily, 77 ft³/s, Oct. 16, 2014.

WATER-QUALITY RECORDS

PERIOD OF RECORD - Water years December 6, 2013 to December 2016.

REMARKS - Water temperature records for 2016, 2015 water year rated excellent. Specific conductance records for 2016, 2015 2014 water year rated excellent except for some periods, which ranged from fair to poor. Turbidity records for 2016, 2015 and 2014 water years rated fair to poor. Dissolved oxygen records for 2016, 2015 water year rated excellent to good. Records for the 2014 water year rated excellent except for some periods, which are rated good. pH records for 2016, 2015 rated excellent to poor. 2014 water year rated excellent except for periods rated from good to fair.

EXTREMES FOR PERIOD OF RECORD - WATER TEMPERATURE: Maximum recorded, 26.6°C, June 26, 2015; minimum recorded, 2.6°C, January 1, 2016. SPECIFIC CONDUCTANCE: Maximum recorded, 110 microsiemens, March 7, 2014; minimum recorded, 8.0 microsiemens, June 10, 11 2014. TURBIDITY: Maximum recorded, 990 FNU, March 6, 2014; minimum recorded, 0.0 FNU, many days. DISSOLVED OXYGEN: Maximum recorded, 13.7 mg/L, December 9, 2013; minimum recorded, 7.6 mg/L, July 1 and 22, 2014. pH: Maximum recorded, 8.7 standard units, September 9, 2014; minimum recorded 6.0 standard units, June 22,23,24,28 and July 24 and 25, 2016.