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Water-Year Summary for Site 11121000

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  • Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
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Available Parameters
00054 Reservoir storage(Obs.)  

Water year 2023: 2022-10-01 to 2023-09-30
 
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USGS Water-Year Summary 2023
11121000 Santa Ynez River at Jameson Lake, near Montecito, CA
LOCATION - Lat 34°29'32", long 119°30'25" referenced to North American Datum of 1927, in NE 1/4 NW 1/4 sec.28, T.5 N., R.25 W., Santa Barbara County, CA, Hydrologic Unit 18060010, on upstream face of Juncal Dam, 6.5 mi north of Carpinteria, and 8 mi northeast of Montecito.
DRAINAGE AREA - 13.9 mi², excludes area of Alder Creek.
SURFACE-WATER RECORDS
PERIOD OF RECORD - December 1930 to October 20, 2013 (discontinued). Prior to October 1938, published as "at Juncal Reservoir."
GAGE - Two water-stage recorders. Elevation of lake gage is 2,021.6 ft, U.S. Bureau of Reclamation Datum, or 2,000 ft above NGVD of 1929. Supplementary gage and sharp-crested weir on outlet conduit of lake release, at different datum.
COOPERATION - Precipitation and evaporation records provided by Montecito Water District.
REMARKS - This gage was inactive during 2014 water year, no record collected, processed, or stored. Records of total inflow represent all water reaching Jameson Lake, including precipitation on the lake. Total inflow computed on basis of records of storage, diversion (draft) to city of Montecito, spill and release (station 11121010) to river, evaporation, and seepage. Records of net inflow exclude precipitation on lake surface. Monthly evaporation from lake surface computed on basis of evaporation from U.S. Weather Bureau Class A land pan. Area and capacity tables are based on bathymetric survey completed on Sept. 24, 2013. Lake capacity at spillway level, elevation 2,223.82 ft, 5,121 acre-ft based on bathymetric survey of Sept. 24, 2013. There is no regulation or diversion upstream from station. At times flow of Alder Creek, which enters Santa Ynez River 2 mi downstream from Juncal Dam, is diverted at elevation 2,250 ft through a tunnel to Jameson Lake and is included in these records. See schematic diagram of Santa Ynez River Basin available from the California Water Science Center.
AVERAGE DISCHARGE FOR PERIOD OF RECORD - 82 years (since water year 1932), spill and release, 9.01 ft³/s, 6,530 acre-ft/yr.