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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
11028500 Santa Maria Creek near Ramona, CA
LOCATION - Lat 33°03'08", long 116°56'41" referenced to North American Datum of 1927, in SE 1/4 SE 1/4 sec.11, T.13 S., R.1 W., San Diego County, CA, Hydrologic Unit 18070304, on left bank, 3.8 mi northwest of Ramona, and 4.6 mi upstream from mouth.
DRAINAGE AREA - 57.6 mi².
REVISIONS HISTORY - WSP 1285: 1952. WSP 1928: Drainage area.
SURFACE-WATER RECORDS
PERIOD OF RECORD - December 1912 to September 1920, October 1946 to current year.
GAGE - Water-stage recorder. Concrete control since October 1946. Datum of gage is 1,296.39 ft above NAVD of 1988. Prior to Oct. 1, 1946, at same site, at datum 1.78 ft lower.
REMARKS - No regulation upstream from station. Land application of treated sewage effluent upstream from the gage beginning December 1972 contributes to low flows.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 15,200 ft³/s, Feb. 21, 1980, gage height, 14.39 ft, from rating curve extended above 166 ft³/s, on basis of slope-area measurements at gage heights 4.56 ft and 14.39 ft; no flow for many days in most years.
