USGS Water-Year Summary 2021
11465690 Colgan Creek near Santa Rosa, CA
LOCATION - Lat 38°24'08", long 122°43'55" referenced to North American Datum of 1927, Sonoma County, CA, Hydrologic Unit 18010110, in Llano de Santa Rosa Grant, on right bank upstream side of Burgess Drive bridge to Elsie Allen High School, north of Bellevue Road, in Santa Rosa.
DRAINAGE AREA - 3.40 mi².
PERIOD OF RECORD - October 2006 to current year (seasonal records only).
GAGE - Water stage recorder and crest-stage gage. Datum of gage is NGVD of 1929.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 922 ft³/s, Dec. 15, 2016, gage height 103.08 ft; Maximum gage height, 104.97 ft, Jan. 23, 2012; no flow for many days in most years.