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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
11459150 Petaluma River at Copeland Pumping Station, at Petaluma, CA
LOCATION - Lat 38°14'18", long 122°38'21" referenced to North American Datum of 1927, in NE 1/4 NW 1/4 sec.33, T.5 N., R.7 W., Sonoma County, CA, Hydrologic Unit 18050002, on left bank, 0.1 mi upstream from Washington Street Bridge, at Copeland Pumping Station, in Petaluma.
DRAINAGE AREA - 45.4 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1998 to September 2008, October 2009 to October 31, 2016 (discontinued). Tidally filtered daily mean flows only since October 2010.
GAGE - Water-stage recorder and velocity meter. Datum of gage is NGVD of 1929.
REMARKS - Prior to Oct. 1, 2013, no records computed below 20 ft³/s. Streamflow at this site are affected significantly by astronomical tides. Daily mean discharge was computed using the Godin low-pass filter to remove tidal effects from instantaneous values. By convention, the U.S. Geological Survey has established ebb (seaward) flows as positive flows and flood (landward) flows as negative flows.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 9,620 ft³/s, Dec. 31, 2005, gage height, 10.04 ft, from backwater.
