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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
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USGS Water-Year Summary 2024
11044250 Rainbow Creek near Fallbrook, CA
LOCATION - Lat 33°24'27", long 117°12'00" referenced to North American Datum of 1927, in NW 1/4 SE 1/4 sec.09, T.9 S., R.3 W., San Diego County, CA, Hydrologic Unit 18070302, on left bank, 1.0 mi upstream from the confluence with Santa Margarita River, and 3.4 mi northeast of Fallbrook. Address is 2021 Willow Glen Rd, Fallbrook, San Diego County, CA 92028.
DRAINAGE AREA - 10.3 mi².
REVISIONS HISTORY - WDR CA-91-1: 1990 (instantaneous maximum discharge).
SURFACE-WATER RECORDS
PERIOD OF RECORD - November 1989 to current year.
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 531.37 ft above NAVD of 1988.
REMARKS - No regulation upstream from station. Undetermined amount of water upstream from station used for irrigation by a local nursery. Natural flow affected by return flow from irrigated areas. Water is imported for domestic use and irrigation. See schematic diagram of Santa Margarita River Basin available from the California Water Science Center.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 8,000 ft³/s, estimated, Jan. 16, 1993, gage height unknown, on basis of slope-area measurement of peak flow, maximum recorded gage height, 10.41 ft, Jan. 11, 2005, Dec. 22, 2010; minimum daily, 0.01 ft³/s, Sept. 22, Nov. 3, 2002.
