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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
11133000 Santa Ynez River at Narrows, near Lompoc, CA
LOCATION - Lat 34°38'10", long 120°25'25" referenced to North American Datum of 1927, Santa Barbara County, CA, Hydrologic Unit 18060010, in Canada de Salsipuedes Grant, on left bank, 0.6 mi upstream from State Highway 246, 1.8 mi downstream from Salsipuedes Creek, 1.9 mi east of Lompoc, and 33.0 mi downstream from Lake Cachuma.
DRAINAGE AREA - 789 mi².
REVISIONS HISTORY - WSP 1928: Drainage area.
SURFACE-WATER RECORDS
PERIOD OF RECORD - May 1947 to November 1951 (irrigation seasons only). May 1952 to September 1963, October 1964 to September 1979, October 1980 to current year. Records equivalent, except for low-flow periods, to those published as "near Lompoc" (station 11133500), November to December 1906, October 1907 to September 1918, May 1925 to September 1960, and October 1978 to September 1980.
GAGE - Water-stage recorder. Datum of gage is 87.46 ft above NAVD of 1988. Prior to Apr. 10, 1991, at datum 5 ft higher. See WSP 1715 for history of changes prior to Oct. 1, 1961. Since Oct. 1, 1961, at various sites and datums within 0.1 mi of present site.
REMARKS - Flow regulated by Jameson Lake, Gibraltar Reservoir, and since November 1952, by Lake Cachuma (stations 11121000, 11122000, and 11125500, respectively). Water diverted out of Jameson Lake, Gibraltar Reservoir, and Lake Cachuma to cities of Montecito, Santa Barbara, and Goleta for municipal supply. Water pumped from wells along banks of river for irrigation in valley upstream. See schematic diagram of Santa Ynez River Basin available from the California Water Science Center.
EXTREMES OUTSIDE PERIOD OF RECORD - Flood of Jan. 9, 1907, reached a stage of 22.0 ft, site and datum then in use, discharge, 120,000 ft³/s, from mean-depth study.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 80,000 ft³/s, Jan. 25, 1969, gage height, 24.20 ft, from supplementary gage; no flow at times in most years.
WATER-QUALITY RECORDS
PERIOD OF RECORD -
DISCRETE WATER-QUALITY DATA:
CHEMICAL DATA: Water years 1978-88, 1997 to current year.
CONTINUOUS WATER-QUALITY DATA:
SPECIFIC CONDUCTANCE: Water years October 1998 to September 2003 (seasonal), October 2003 to current year.
WATER TEMPERATURE: Water years October 1998 to September 2004 (seasonal), October 2004 to current year.
REMARKS - Interruption in record due to no channel discharge. The practice of assigning qualitative accuracy ratings to water-quality data was discontinued in water year 2017.
Discrete water-quality sample results and supporting metadata are published on NWISweb. Data-Quality Indicator Code of "R" indicates reviewed and approved data. DQI Status of "S" indicates provisional data.
Discrete water-quality sample results and supporting metadata are published on NWISweb. Data-Quality Indicator Code of "R" indicates reviewed and approved data. DQI Status of "S" indicates provisional data.
