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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
11045600 O'Neill Lake Outlet Channel near Fallbrook, CA
LOCATION - Lat 33°19'30", long 117°19'29" referenced to North American Datum of 1927, in SE 1/4 NW 1/4 sec.08, T.10 S., R.4 W., San Diego County, CA, Hydrologic Unit 18070302, on Camp Joseph H. Pendleton Naval Reservation, on left bank, 300 ft downstream from O'Neill Lake, and 5.5 mi southwest of Fallbrook.
DRAINAGE AREA - 9.77 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1998 to February 2003, October 2003 to current year.
GAGE - Water-stage recorder and concrete control with low-water V-notch weir. Datum of gage is 93.82 ft above NAVD of 1988.
REMARKS - Records for this station represent regulated releases from O'Neill Lake. Water is sometimes diverted into O'Neill Lake from the Santa Margarita River via a diversion dam 0.9 mi above gage. Slight regulation by two small storage reservoirs upstream from gaging station on Fallbrook Creek near Fallbrook (station 11045300). See schematic diagram of Santa Margarita River Basin available from the California Water Science Center.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 72.0 ft³/s, Feb. 08, 2024, gage height, 4.65 ft. Peak gage height 5.38 ft, Feb. 06, 2024; no flow at times in most years.
