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USGS Water-Year Summary 2024
11122000 Santa Ynez River above Gibraltar Dam, near Santa Barbara, CA
LOCATION - Lat 34°31'34", long 119°41'08" referenced to North American Datum of 1927, in NW 1/4 SW 1/4 sec.11, T.5 N., R.27 W., Santa Barbara County, CA, Hydrologic Unit 18060010, in Los Padres National Forest, on upstream face of Gibraltar Dam, and 7 mi north of Santa Barbara.
DRAINAGE AREA - 216 mi².
REVISIONS HISTORY - WSP 706: 1921-22. WSP 1041: 1944. WSP 1395: Drainage Area. WSP 1635: 1914, 15 (instantaneous maximum discharge). WDR CA-86-1: 1934-43.
SURFACE-WATER RECORDS
PERIOD OF RECORD - April 1920 to current year. November 1903 to November 1918 (fragmentary) at river station at damsite; records not equivalent because records since April 1920 are based on operation of Gibraltar Reservoir, and since December 1930, Jameson Lake. Prior to October 1945, published as "Santa Ynez River near Santa Barbara."
GAGE - Water-stage recorder. Datum of gage is NGVD of 1929 and 2.40 ft above NAVD of 1988. Supplementary gage and sharp-crested weir on diversion from reservoir at different datum. See WSP 1735 for history of changes on both gages prior to Oct. 1, 1955. Spill and release measured by station 11123000 downstream from dam.
COOPERATION - Precipitation and evaporation data provided by the City of Santa Barbara.
REMARKS - Records of total inflow represent all water reaching Gibraltar Reservoir, including precipitation on reservoir. Total inflow computed on basis of records of storage, diversion (draft-station 11121900) to city of Santa Barbara, spill and release (station 11123000) to river, evaporation, and seepage. Records of net inflow exclude precipitation on reservoir surface. Monthly evaporation from reservoir surface computed on basis of evaporation from U.S. Weather Bureau Class A land pan. Area and capacity tables based on bathymetric survey made in May 2013. Reservoir capacity at spillway level, elevation 1,399.82 ft, 5,200 acre-ft. Lowest outlet at elevation 1,333.86 ft. Flow regulated by Jameson Lake (station 11121000) since December 1930. See schematic diagram of Santa Ynez River Basin available from the California Water Science Center.
