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USGS Water-Year Summary 2024
11156500 San Benito River near Willow Creek School, CA
LOCATION - Lat 36°36'34", long 121°12'07" referenced to North American Datum of 1927, in SE 1/4 SE 1/4 sec.21, T.15 S., R.7 E., San Benito County, CA, Hydrologic Unit 18060002, on left bank, 0.85 mi downstream from Willow Creek, 0.9 mi northwest of Willow Creek School Historic site, and 10 mi northwest of San Benito Junction.
DRAINAGE AREA - 249 mi².
REVISIONS HISTORY -
WSP 1565: 1948 (instantaneous maximum discharge), 1949. WSP 1315-B: Drainage area.
Gage-height & Discharge records for the period April 13, 2021 to April 22, 2021, were revised on May 28, 2021.
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1939 to current year. Monthly discharge only for some periods, published in WSP 1315-B.
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 925.52 ft above NGVD of 1929 and 929.23 ft above NAVD of 1988. Prior to Jan. 28, 1948, and Nov. 11, 1955, to Sept. 30, 1965, at site 0.9 mi downstream at different datum. Jan. 28, 1948, to Nov. 10, 1955, and Oct. 1, 1965, to Oct. 22, 1970, at present site at datum 2.37 ft higher.
REMARKS - Medium and low flows frequently regulated by Hernandez Reservoir 40 mi upstream beginning in December 1961, capacity, 18,500 acre-ft. Small diversions upstream from station for irrigation.
EXTREMES OUTSIDE PERIOD OF RECORD - Flood of February 1938 reached a stage of about 9.0 ft, from floodmarks, at former site 0.9 mi downstream, referenced to datum used at that site, flow estimated at 9,000 ft³/s, based on 1941 peak and rating extrapolation.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 9,660 ft³/s, Mar. 10, 1995, gage height, 14.55 ft, from floodmarks, from rating curve extended above 2,100 ft³/s, on basis of slope-area measurement at gage height 12.94 ft; no flow at times.
