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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
11126000 Santa Ynez River near Santa Ynez, CA
LOCATION - Lat 34°35'21", long 119°59'16" referenced to North American Datum of 1927, Santa Barbara County, CA, Hydrologic Unit 18060010, in Canada de los Pinos Grant, on right bank, 0.7 mi downstream from Bradbury Dam, 2.8 mi upstream from Santa Agueda Creek, and 5.5 mi southeast of Santa Ynez.
DRAINAGE AREA - 422 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - December 1928 to September 1931, October 1932 to September 1976, April 1994 to September 2001, October 2002 to September 2009 (seasonal records only), October 2001 to September 2002, October 2009 to current year (stage and discharge measurements only).
GAGE - Water-stage recorder. Datum of gage is 543.02 ft above NAVD of 1988. Prior to Oct. 1, 1955, at site 2.5 mi downstream at different datum. Oct. 1, 1955, to Sept. 16, 1969, at site 0.4 mi downstream at datum 7.2 ft higher. Oct. 2, 2003, to present at site 265 ft downstream at datum 5 ft lower.
REMARKS - Flow regulated by Jameson Lake (station 11121000) since December 1930, Gibraltar Reservoir (11122000) since April 1920, and Lake Cachuma (11125500) since November 1952. Water diverted out of basin from Jameson Lake, Gibraltar Reservoir, and Lake Cachuma to cities of Montecito and Santa Barbara, and to the Santa Ynez Valley for municipal supply. Some water pumped from wells along river banks for irrigation. See schematic diagram of Santa Ynez River Basin available from the California Water Science Center.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 79,000 ft³/s, Jan. 25, 1969, gage height, 22.00 ft, from floodmark, present datum, on basis of computation of maximum flow over dam; no flow at times in some years.
WATER-QUALITY RECORDS
PERIOD OF RECORD -
DISCRETE WATER-QUALITY DATA:
CHEMICAL DATA: Water years 1992 to current year.
CONTINUOUS WATER-QUALITY DATA:
WATER TEMPERATURE: Water years July 1994 to current year.
SPECIFIC CONDUCTANCE: Water years July 1994 to November 1994, October 1995 to current year.
DISSOLVED OXYGEN: Water years October 2008 to current year.
DISCRETE WATER-QUALITY DATA:
CHEMICAL DATA: Water years 1992 to current year.
CONTINUOUS WATER-QUALITY DATA:
WATER TEMPERATURE: Water years July 1994 to current year.
SPECIFIC CONDUCTANCE: Water years July 1994 to November 1994, October 1995 to current year.
DISSOLVED OXYGEN: Water years October 2008 to current year.
