USGS Water-Year Summary 2021
11069500 San Jacinto River near San Jacinto, CA
LOCATION - Lat 33°44'17", long 116°49'59" referenced to North American Datum of 1927, in SE 1/4 NE 1/4 sec.13, T.5 S., R.1 E., Riverside County, CA, Hydrologic Unit 18070202, on left bank, 0.6 mi downstream from bridge on State Highway 74, 1.5 mi downstream from North Fork San Jacinto River, 7.8 mi southeast of San Jacinto, and 9.5 mi downstream from Lake Hemet.
DRAINAGE AREA - 142 mi².
- WSP 881: 1938. WSP 1635: 1950. WSP 1928: Drainage area. WDR CA-97-1: Date of peak discharge for Water Year 1991.
PERIOD OF RECORD - October 1920 to September 1991, October 1996 to current year. River only records for October 1969 to September 1980 and October 1981 to September 1991 are at site upstream of Lake Hemet Municipal Water District's lower canal and are equivalent to other records if lower canal diversion is deducted from flow past station. Records of lower canal diversion are available at Lake Hemet Municipal Water District. Combined records of river and diversions are equivalent for October 1948 to September 1981. Combined records of river and diversion for October 1981 to September 1990, published in WDR CA-82-1 to WDR CA-90-1, are not equivalent due to diversion for municipal supply upstream of gages beginning in 1982. Monthly discharge only for October 1920 and July to September 1926 are published in WSP 1315-B.
GAGE - Water-stage recorder, concrete control, and crest-stage gage. Datum of gage is 1,924.89 ft above NAVD of 1988. From 1927 to 1991 gage operated at various locations and datums approximately 0.6 mi upstream. See WDR CA-91-1 for further description.
EXTREMES FOR PERIOD OF RECORD - (River only) Maximum discharge, 45,000 ft³/s, Feb. 16, 1927, gage height unknown, on basis of slope-area measurement of peak flow; no flow for several months in some years.