USGS Water-Year Summary 2024

11046100 Las Flores Creek near Oceanside, CA

LOCATION - Lat 33°17'37", long 117°27'11" referenced to North American Datum of 1983, in SE 1/4 NE 1/4 sec.24, T.10 S., R.6 W., San Diego County, CA, Hydrologic Unit 18070301, on Camp Joseph H. Pendleton Naval Reservation, at right bank, west of Stuart Mesa Road, 0.75 mi upstream from mouth, and 8.0 mi northwest of Oceanside.

DRAINAGE AREA - 26.1 mi².

REVISIONS HISTORY - WDR CA-72-1: 1971 (instantaneous maximum discharge).

SURFACE-WATER RECORDS

PERIOD OF RECORD - May 1951 to September 1967, October 1969 to September 1979, October 1993 to current year (crest-stage gage only, starting October 2023). Discharge records for October 1967 to September 1969 and October 1979 to September 1993 available in files of U.S. Marine Corps at Camp Pendleton.

GAGE - Water-stage recorder and multiple concrete culvert control. Datum of gage is 39.52 feet above NAVD of 1988.  

REMARKS - No regulation upstream from station. Camp Pendleton Water Treatment Plant No. 9 discharges to the channel at a point approximately 2.7 mi upstream from gage. Some pumping upstream from station for irrigation.

EXTREMES OUTSIDE PERIOD OF RECORD - Flood of Feb. 25, 1969, reached a stage of 7.25 ft, from floodmarks, discharge, 4,200 ft³/s.

EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 7,300 ft³/s, estimated, Mar. 4, 1978, gage height, 13.67 ft, from floodmarks, based on culvert computation of peak flow; no flow for several days in most years.