USGS Water-Year Summary 2023
11289650 Tuolumne River below La Grange Dam, near La Grange, CA
LOCATION - Lat 37°39'59", long 120°26'28" referenced to North American Datum of 1927, in NW 1/4 NW 1/4 sec.21, T.3 S., R.14 E., Stanislaus County, CA, Hydrologic Unit 18040009, on left bank, 0.5 mi downstream from La Grange Dam, and 1.1 mi east of La Grange.
DRAINAGE AREA - 1,538 mi².
- See Time-series Revision Statements.
PERIOD OF RECORD - October 1970 to current year.
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 170.19 ft above NGVD of 1929 (levels by Turlock Irrigation District).
EXTREMES FOR PERIOD OF RECORD - River only, maximum discharge, 58,900 ft³/s, Jan. 3, 1997, gage height, 28.43 ft; no flow for several days during September and October 1977.
Combined flow, maximum daily discharge, 50,100 ft³/s, Jan. 3, 1997; minimum daily, 0.45 ft³/s, Nov. 2, 1970.
PERIOD OF RECORD
CONTINUOUS WATER-QUALITY DATA:
WATER TEMPERATURE: Water years November 1970 to current year.
INSTRUMENTATION - Thermistor equipped water-quality recorder since November 1970.