USGS Water-Year Summary 2021
11447650 Sacramento River at Freeport, CA
- Lat 38°27'22", long 121°30'01" referenced to North American Datum of 1927, in NE 1/4 SE 1/4 sec.14, T.7 N., R.4 E., Sacramento County, CA, Hydrologic Unit 18020163,
220 ft west of intersection of Highway 160 and county road E9, on eastern Freeport Bridge fender, downstream side, 11.5 mi south of Sacramento.
DRAINAGE AREA - Indeterminate.
- WDR CA-96-4: 1994-1995 (peaks above base).
PERIOD OF RECORD - January 1904 to July 1905 (gage heights only), June to November 1921, October 1948 to current year. Prior to October 1979, published as "Sacramento River at Sacramento" (station 11447500).
GAGE - Short-range acoustic doppler velocity meter with upward-looking stage sensor. Datum of gage is 100 ft below NGVD of 1929. Prior to Nov. 16, 1956, nonrecording gage and water-stage recorder at various sites in vicinity of I Street Bridge in Sacramento, 13 mi upstream at datum of low-water mark of Oct. 23, 1856, 0.12 ft above NGVD of 1929. Nov. 17, 1956, to Sept. 20, 1979, at site 1,000 ft upstream from I Street Bridge. Sept. 21, 1979, to Oct. 1, 2001, datum was NGVD of 1929.
EXTREMES OUTSIDE PERIOD OF RECORD - Maximum discharge known prior to Nov. 21, 1950, 103,000 ft³/s, Jan. 17, 1909, elevation, 129.6 ft, site then in use at present datum, from reports of California Department of Water Resources.
EXTREMES FOR PERIOD OF RECORD - (Since 1949) Maximum discharge, 117,000 ft³/s, Feb. 19, 1986, elevation, 125.00 ft, at present datum; minimum daily, 3,970 ft³/s, Oct. 15, 1977.
PERIOD OF RECORD
DISCRETE WATER-QUALITY DATA:
CHEMICAL DATA: Water years 1959 to current year.
BIOLOGICAL DATA: Water years 1974-81.
SEDIMENT DATA: Water years 1957 to current year (prior to water year 1980, published as 11447500 "Sacramento River at Sacramento").
CONTINUOUS WATER-QUALITY DATA:
CHEMICAL DATA: June 1960 to June 1963.
SPECIFIC CONDUCTANCE: February 1974 to July 1975, November 1988 to September 1994, October 1995 to September 1998 to current year.
WATER TEMPERATURE: June 1960 to current year.
SUSPENDED SEDIMENT DISCHARGE: October 1956 to current year.
DISSOLVED OXYGEN: Water years August 2013 to current year.
pH: Water years August 2013 to current year.
TURBIDITY: Water years August 2013 to current year.
CHLOROPHYLL-A FLUORESCENCE: Water years August 2013 to current year.
FLUORESCENT DISSOLVED ORGANIC MATTER: Water years August 2013 to current year.
NITRATE + NITRITE AS NITROGEN: Water years August 2013 to current year.
SALINITY: Water years August 2013 to current year.
DISSOLVED OXYGEN PERCENT SATURATION: Water years August 2013 to current year.
INSTRUMENTATION - Water-temperature recorder June 1960 to November 1988. Water-quality monitor since November 1988.