USGS Water-Year Summary 2021
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.
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. Elevation of gage is 100 ft above NGVD of 1929, from topographic map.
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.