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USGS Water-Year Summary 2024
11044350 Sandia Creek near Fallbrook, CA
LOCATION - Lat 33°25'28", long 117°14'54" referenced to North American Datum of 1927, in SW 1/4 NE 1/4 sec.01, T.9 S., R.4 W., San Diego County, CA, Hydrologic Unit 18070302, on left bank, 0.8 mi upstream from mouth, 1.05 mi north of intersection of Sandia and Rock Mountain Roads, and 3.8 mi north of Fallbrook.
DRAINAGE AREA - 21.1 mi².
REVISIONS HISTORY - WDR CA-91-1: 1990 (instantaneous maximum discharge).
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1989 to current year.
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 382.80 ft above NAVD of 1988. Prior to Sept. 30, 1993, at site 0.65 mi downstream at different datum.
REMARKS - No regulation or diversion upstream from station. Natural flow affected by pumping and return flow from irrigated areas. See schematic diagram of Santa Margarita River Basin available from the California Water Science Center.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 5,100 ft³/s, Jan. 16, 1993, gage height, 17.60 ft, site and datum then in use, from floodmarks (may have been affected by backwater from the Santa Margarita River); no flow for many days in summer of 1996.
