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USGS Water-Year Summary 2024
11046530 San Juan Creek at La Novia Street Bridge, at San Juan Capistrano, CA
LOCATION - Lat 33°30'09", long 117°38'50" referenced to North American Datum of 1927, in NW 1/4 SE 1/4 sec.06, T.8 S., R.8 W., Orange County, CA, Hydrologic Unit 18070301, on right bank, 20 ft downstream from La Novia Street Bridge, 1.3 mi upstream from Arroyo Trabuco Creek, and 0.8 mi east of San Juan Capistrano.
DRAINAGE AREA - 109 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1985 to current year. October 1985 to September 1986, published as "San Juan Creek at San Juan Capistrano."
WATER TEMPERATURE: Water years 1986-88.
SEDIMENT DATA: Water years 1986-93.
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 81.51 ft. above NAVD of 1988.
REMARKS - No regulation upstream from station. Capistrano Water Co. diverts water 2.0 mi upstream. Various amounts of diverted water reach station as irrigation return flow. October 1928 to September 1969 and October 1969 to September 1985, data published as "San Juan Creek near San Juan Capistrano" (station 11046500) and "San Juan Creek at San Juan Capistrano" (station 11046550), which are located approximately 1.9 mi upstream and 1.0 mi downstream, respectively. Data for these sites are roughly equivalent.
EXTREMES OUTSIDE PERIOD OF RECORD - Maximum discharge, 22,400 ft³/s, Feb. 25, 1969, gage height, 5.60 ft, from floodmark, at site and datum then in use.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 28,500 ft³/s, estimated, Jan. 11, 2005, gage height, 19.44 ft, from rating curve extended above 3,420 ft³/s, maximum gage height, 22.50 ft, Dec. 22, 2010; no flow for many days most years.
