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USGS Water-Year Summary 2024
11289500 Turlock Canal near La Grange, CA
LOCATION - Lat 37°39'57", long 120°26'24" 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 right bank, 0.4 mi downstream from intake at La Grange Dam, and 1.2 mi east of La Grange.
REVISIONS HISTORY - WSP 1315-A: 1899-1908 (monthly figures only). WSP 1445: 1917-20, 1922. WDR US-2007: 2006.
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1898 to current year. Monthly discharge only for some periods, published in WSP 1315-A.
GAGE - Ultrasonic flow meter and concrete control. Datum of gage is 277.70 ft above NGVD of 1929 and 280.17 ft above NAVD of 1988. See WSP 1930 for history of changes prior to Apr. 17, 1924. May 17, 1984, to Oct. 7, 1999, water-stage recorder at site 0.2 mi downstream at datum 2.72 ft lower.
REMARKS - Canal diverts from left bank of Tuolumne River at La Grange Dam for irrigation in Turlock Irrigation District and to supply town of La Grange. Capacity of canal increased in March 1980 and in March 1984. During autumn and winter, some unmeasured flow is diverted from canal at tunnel 0.1 mi upstream from gage, passed through La Grange Powerplant, and returned to river. See schematic diagram of Tuolumne River Basin available from the California Water Science Center.
EXTREMES FOR PERIOD OF RECORD - Maximum daily discharge, 3,400 ft³/s, several days in May 1984; no diversion for irrigation during some periods in some years; prior to 1939, unmeasured small discharge during winter called zero. No flow Jan. 27, 1984, to Mar. 14, 1984, when canal was drained for construction and installation of electromagnetic flow meter, and many days during most years.
