USGS Water-Year Summary for Site 11417500

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Water year 2023: 2022-10-01 to 2023-09-30

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USGS Water-Year Summary 2023

11417500 South Yuba River at Jones Bar, near Grass Valley, CA

LOCATION - Lat 39°17'32", long 121°06'13" referenced to North American Datum of 1927, in NW 1/4 SE 1/4 sec.32, T.17 N., R.8 E., Nevada County, CA, Hydrologic Unit 18020125, on left bank at Jones Bar, 100 ft upstream from Rush Creek, 0.9 mi downstream from bridge on State Highway 49, and 5 mi northwest of Grass Valley.

DRAINAGE AREA - 308 mi².

REVISIONS HISTORY - WSP 1315-A: 1942-43 (instantaneous maximum discharge), drainage area at former site. WSP 1931: Drainage area.

SURFACE-WATER RECORDS

PERIOD OF RECORD - October 1940 to September 1948, April 1959 to current year. Published as "South Fork Yuba River at Jones Bar" 1940-48, and as "South Yuba River at Jones Bar" 1959-63. Yearly discharge for the 1947 water year published in WSP 1315-A. CHEMICAL DATA: Water years 1965-79, 2000-05. SPECIFIC CONDUCTANCE: Water years 2004-05. WATER TEMPERATURE: Water years 1965-79, 2000-05. SEDIMENT DATA: Water years 1967-74, 2001 (daily), 2002-04 (storm season only).

GAGE - Water-stage recorder and crest-stage gage. Elevation of gage is 1,060 ft above NGVD of 1929, from river-profile map. Oct. 1, 1940, to Sept. 30, 1948, at site 150 ft upstream at datum 2.00 ft higher.

COOPERATION - Records provided by Yuba County Water Agency, under general supervision of the U.S. Geological Survey, in connection with Federal Energy Regulatory Commission project no. 2246.

REMARKS - Flow regulated by Lake Spaulding, Fordyce Lake, and Bowman Lake (stations 11414140, 11414000, and 11415500, respectively) and many smaller reservoirs. Diversions into and out of basin for several powerplants. See schematic diagram of South Yuba River Basin available from the California Water Science Center.

EXTREMES OUTSIDE PERIOD OF RECORD - Flood of Dec. 23, 1955, reached a stage of 30.7 ft, from floodmarks, present datum, at site 100 ft upstream.

EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 53,600 ft³/s, Dec. 22, 1964, gage height, 25.0 ft, from floodmarks, from rating curve extended above 23,000 ft³/s, on basis of slope-area measurement of peak flow; minimum daily, 1.0 ft³/s, Sept. 10-13, 1944.

WATER-QUALITY RECORDS

PERIOD OF RECORD - Water years 1965-79, 2000 to February 2005 (discontinued). SPECIFIC CONDUCTANCE: Water years 2004 to February 2005 (discontinued). WATER TEMPERATURE: Water years 1965-79, 2000 to February 2005 (discontinued). SEDIMENT DATA: Water years 1967-74, 2001 (daily), 2002-04 (storm season only).

PERIOD OF DAILY RECORD - SPECIFIC CONDUCTANCE: December 2003 to February 2005 (discontinued). WATER TEMPERATURE: February 1965 to April 1979, November 2000 to February 2005 (discontinued). SUSPENDED-SEDIMENT DISCHARGE: November 2000 to September 2001 (daily), October 2001 to May 2004 (storm season only).

INSTRUMENTATION - Water-temperature recorder from February 1965 to April 1979, and since November 2000. Specific conductance recorder since December 2003.

EXTREMES FOR PERIOD OF DAILY RECORD - SPECIFIC CONDUCTANCE: Maximum recorded, 126 microsiemens, Aug. 16, 2004; minimum recorded, 40 microsiemens, Feb. 17, 2004. WATER TEMPERATURE: Maximum recorded, 28.5°C, Aug. 7, 8, 1978; minimum recorded, 0.0°C, several days in most years. SEDIMENT CONCENTRATION: Maximum daily mean, 294 mg/L, Mar. 15, 2003; minimum daily mean, 0 mg/L, many days during each year. SEDIMENT LOAD: Maximum daily, 2,250 tons, Dec. 16, 2002; minimum daily, 0 ton, several days in most years.