USGS Water-Year Summary 2021
11045300 Fallbrook Creek near Fallbrook, CA
LOCATION - Lat 33°20'49", long 117°19'01" referenced to North American Datum of 1927, in SE 1/4 SE 1/4 sec.32, T.9 S., R.4 W., San Diego County, CA, Hydrologic Unit 18070302, on Camp Joseph H. Pendleton Naval Reservation, on right bank, at culvert on DeLuz Road, 0.75 mi upstream from O'Neill Lake, and 4.5 mi southwest of Fallbrook.
DRAINAGE AREA - 6.97 mi².
PERIOD OF RECORD - October 1993 to current year. Discharge records for October 1964 to September 1977 and October 1989 to September 1993 available in files of U.S. Marine Corps at Camp Pendleton.
GAGE - Water-stage recorder, crest-stage gage, and concrete control with low-water Parshall flume. Elevation of gage is 190 ft above NGVD of 1929, from topographic map.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 1043 ft³/s, Jan. 22, 2017, gage height, 10.74 ft, from rating curve extension to 1060 ft³/s; no flow for many days in some years.