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Water-Year Summary for Site USGS 11073300

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Available Parameters
00060 Discharge(Mean)  

Water year 2023: 2022-10-01 to 2023-09-30
 
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USGS Water-Year Summary 2023
11073300 San Antonio Creek at Riverside Drive, near Chino, CA
LOCATION - Lat 34°01'07", long 117°43'47" referenced to North American Datum of 1927, San Bernardino County, CA, Hydrologic Unit 18070203, in Santa Ana del Chino Grant, on right bank, at south end of Riverside Drive Bridge, 0.4 mi upstream from confluence with Chino Creek, 2.4 mi northwest of Chino, and 10.2 mi downstream from San Antonio Dam.
DRAINAGE AREA - 36.6 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - December 1998 to current year.
GAGE - Water-stage recorder and concrete-lined flood-control channel. Datum of gage is 720.35 ft above NAVD of 1988. 
REMARKS - Flow mostly regulated by San Antonio Flood-Control Reservoir, capacity, 7,700 acre-ft. Natural streamflow affected by ground-water withdrawals, diversions for power, domestic use, irrigation, and return flow from irrigated areas. Flow at gage is primarily urban runoff, except when releases are made from San Antonio Dam. Releases of imported water are made to San Antonio Creek by the California Water Project at times in some years, from Rialto Pipeline below San Antonio Dam, at a site 10 mi upstream. During the current water year, the California Water Project reported no releases were made into the basin. See schematic diagram of Santa Ana River Basin available from the California Water Science Center.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 3,420 ft³/s, Oct. 20, 2004, gage height, 5.43 ft, from rating curve extended above 576 ft³/s, on basis of step-backwater analysis; no flow at times in most years.