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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
- For water years 2014 onward, choose a water year and parameter and an on-demand Water-Year Summary report will be generated.
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USGS Water-Year Summary 2024
11044300 Santa Margarita River at Fallbrook Public Utility District Sump, near Fallbrook, CA
LOCATION - Lat 33°24'49", long 117°14'25" referenced to North American Datum of 1927, in NW 1/4 NW 1/4 sec.07, T.9 S., R.4 W., San Diego County, CA, Hydrologic Unit 18070302, on left bank, 0.3 mi upstream from confluence with Sandia Creek, and 2.9 mi north of Fallbrook.
DRAINAGE AREA - 620 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1989 to current year.
DISSOLVED OXYGEN: Water years 2000-03.
pH: Water years 2000-03.
SPECIFIC CONDUCTANCE: Water years 2000-03.
WATER TEMPERATURE: Water years 2000-03.
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 335.58 ft above NAVD of 1988.
REMARKS - Flow partly regulated since November 1948 by Vail Lake (station 11042510) and since 1974 by Skinner Reservoir. Flow in Warm Springs Creek, a tributary to Murrieta Creek, slightly regulated beginning in water year 1999 by Diamond Valley Lake, capacity, 800,000 acre-ft (see station 11042800). See schematic diagram of Santa Margarita River Basin available from the California Water Science Center.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 34,000 ft³/s, estimated, based on regression equation and flood routing of upstream flows, Jan. 16, 1993, gage height, 15.89 ft; no flow several days in 1990.
