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Water-Year Summary for Site USGS 11290000

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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.,Med.)  
00060 Discharge(Mean)  
00095 Specific cond at 25C(Mean,Max.,Min.,Med.)  

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

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USGS Water-Year Summary 2020
11290000 Tuolumne River at Modesto, CA
LOCATION - Lat 37°37'38", long 120°59'00" referenced to North American Datum of 1927, in NW 1/4 SE 1/4 sec.33, T.3 S., R.9 E., Stanislaus County, CA, Hydrologic Unit 18040009, on left bank, 150 ft downstream from Dry Creek, 0.2 mi upstream from 9th Street Bridge.
DRAINAGE AREA - 1,884 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - 1878-84, 1891-94, 1897 (gage heights only), January 1895 to December 1896, April 1940 to current year. Monthly discharge only for some periods, published in WSP 1315-A. Water-quality data for the period October 1985 to March 1987 are available in U.S. Geological Survey Open-File Report 88-479. Water-quality data for the period April 1987 to September 1988 are available in files of the U.S. Geological Survey.
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is NGVD of 1929 (levels by Modesto Irrigation District). Prior to July 11, 1947, at site 2,600 ft downstream at same datum; July 11, 1947, to Nov. 16, 1953, at site 1,900 ft downstream at same datum. Nov. 17, 1953 to Apr. 28, 2004, at site 900 ft downstream, at same datum. Gage was reestablished on May 28, 2010, 1,000 ft upstream at same datum.
REMARKS - Flow regulated by reservoirs and powerplants upstream from station. Several major diversions upstream of station, including Modesto and Turlock Canals (stations 11289000 and 11289500). See REMARKS for Tuolumne River below La Grange Dam (station 11289650) and schematic diagram of Tuolumne River Basin available from the California Water Science Center.
EXTREMES FOR PERIOD OF RECORD - (Water years 1896, and since water year 1941) Maximum discharge observed, 57,000 ft³/s, Dec. 9, 1950, elevation, 69.19 ft, maximum gage height, 71.21 ft, Jan. 4, 1997 (backwater caused by debris on railroad trestle 2,500 ft downstream of gage); minimum daily, 48 ft³/s, Sept. 9, 16, 2015.
WATER-QUALITY RECORDS
PERIOD OF RECORD -

DISCRETE WATER-QUALITY DATA:
CHEMICAL DATA: Water years 1985-88, 1993-95.
SEDIMENT: Water years 1985-88, 1993-95.

CONTINUOUS WATER-QUALITY DATA:
SPECIFIC CONDUCTANCE: Water years October 1985 to September 1988, December 1988 to March 1995, December 2000 to current year.
WATER TEMPERATURE: Water years July 1965 to April 1979, October 1985 to March 1995, December 2000 to current year.

INSTRUMENTATION - Water-quality monitor since December 2000.
REMARKS - Data for the period October 1985 to March 1987 are available in U.S. Geological Survey Open-File Report 88-479. Data for the period April 1987 to September 1988 are available in the files of the U.S. Geological Survey. Interruptions in record were due to malfunction of the recording instrument.