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Water-Year Summary for Site 11447650

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  • Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
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Available Parameters
00060 Discharge(Mean)  
72137 Discharge,tide fltrd(Mean)  
80154 Suspnd sedmnt conc(Mean)  
80155 Suspnd sedmnt disch(Mean)  

Water year 2022: 2021-10-01 to 2022-09-30

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USGS Water-Year Summary 2022
11447650 Sacramento River at Freeport, CA
LOCATION - 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.
REVISIONS HISTORY - 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.
REMARKS - Natural flow of stream affected by storage reservoirs, diversions for irrigation and flood control, return flow from irrigated areas, and tides. Flood flows bypass station through Sacramento Weir Spill to Yolo Bypass (stations 11426000 and 11453000). See schematic diagrams of lower Sacramento River Basin and Sacramento-San Joaquin Delta available from the California Water Science Center.
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.

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").

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.
REMARKS - Records of sediment discharge from 1957 to 1979 were obtained at "Sacramento River at Sacramento" (station 11447500) and are considered equivalent. Additional specific-conductance, monthly chemical, and trace-element data are available in files of the U.S. Geological Survey. Water-quality data collected as part of the National Stream Quality Accounting Network (NASQAN). Rating of water quality records discontinued in 2017 water year.

Note: For the collection of in situ nitrate concentrations over the periods of collection 1/14/2015  11:15:00 AM - 9/2/2015  7:30:00 AM, and 8/7/2018  9:45:00 AM - 10/30/2018  12:15:00 PM a 5 mm pathlength sensor was used to observe in situ nitrate concentrations. A 5mm pathlength can decrease attenuation of UV light in the sample path in high turbidity (e.g. > 600 NTUs) or high CDOM water. 5mm accuracy in fresh/seawater = 0.056 mgN/L (4 μM). For instruments with a 10mm pathlength, accuracy in fresh/seawater = 0.028 mgN/L (2 μM).  10 mm instruments deployed unless noted.