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Water-Year Summary for Site 11446220

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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.
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  • For water years 2005 and earlier, Annual Water Data Reports may be available in digital format.
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Available Parameters
00010 Temperature, water(Max.,Min.,Med.,Mean)  

Water year 2018: 2018-10-01 to 2019-09-30

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USGS Water-Year Summary 2018
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.
PERIOD OF DAILY RECORD - October 1998 to current year. WATER TEMPERATURE: October 1,1998 to October 16,2009, station was located just below the Folsom Dam spillway. October 2009 station was relocated approximately 1.5 miles downstream to accommodate spillway construction. February 29, 2017 sensor was destroyed by high flows during winter storms. May 9, 2017 station was relocated .42mi below the completed spillway per the contract with BOR.
INSTRUMENTATION - Water-temperature recorder.
REMARKS - Temperature records for the 2016 water year rated excellent except for Oct. 1-15, which are good. Temperature records for the 2015 water year rated excellent except for Sept. 25-30, which are good. Temperature records for the 2014 water year rated excellent except for Apr. 3 to May 22, which are good. Water temperature is affected by upstream releases from Folsom Dam.
EXTREMES FOR PERIOD OF DAILY RECORD - WATER TEMPERATURE: Maximum recorded, 22.7°C, Aug. 14, 2016; minimum recorded, 6.5°C, Feb. 9, 2002.