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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
- For water years 2014 onward, choose a water year and parameter and an on-demand Water-Year Summary report will be generated.
- For water years 2006 through 2013, choose a water year and an Annual Water Data Report will be provided.
- For water years 2005 and earlier, Annual Water Data Reports may be available in digital format.
- Not all sites have reports available for every water year.
USGS Water-Year Summary 2024
11465700 Colgan Creek near Sebastopol, CA
LOCATION - Lat 38°22'25", long 122°46'02" referenced to North American Datum of 1927, Sonoma County, CA, Hydrologic Unit 18010110, in Llano de Santa Rosa Grant, on left bank, downstream side of Llano Road bridge, 0.5 mi upstream of Laguna de Santa Rosa, and 3.5 mi southeast of Sebastopol.
DRAINAGE AREA - 6.78 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - November 1998 to current year.
GAGE - Water-stage recorder and velocity meter. Datum of gage is NGVD of 1929 and 2.73 ft above NAVD of 1988.
REMARKS - No regulation or diversion upstream of station. High flow periods are effected by backwater from Laguna de Santa Rosa. See schematic diagram of Russian River Basin available from the California Water Science Center.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 934 ft³/s, Dec. 31, 2005, gage height, 79.21 ft; no flow for many days in each year.
