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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
11446220 American River below Folsom Dam, near Folsom, CA
LOCATION - Lat 38°42'16.3", long 121°09'51.7" referenced to North American Datum of 1983, in NW 1/4 SW 1/4 sec.24, T.10 N., R.7 E., Sacramento County, CA, Hydrologic Unit 18020111, on right bank, upstream of Folsom Lake Crossing bridge, 0.47 mi downstream from Folsom Dam, and 2.0 mi north of Folsom.
DRAINAGE AREA - 1,863 mi².
REVISIONS HISTORY - WDR US-2010: Drainage Area.
WATER-QUALITY RECORDS
PERIOD OF RECORD -
CONTINUOUS WATER-QUALITY DATA:
WATER TEMPERATURE: Water years October 1, 1998 to October 16, 2009, station was located just below the Folsom Dam spillway. October 2009 station was relocated approximately 1.5 mi downstream to accommodate spillway construction. February 29, 2017 sensor was destroyed by high flows during winter storms. May 9, 2017 station was relocated 0.42 mi below the completed spillway per the contract with BOR. (water years 199-2023, daily).
INSTRUMENTATION - Water-temperature recorder.
REMARKS - Water temperature is affected by upstream releases from Folsom Dam.
