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Water-Year Summary for Site 11422500

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Available Parameters
00060 Discharge(Mean)  

Water year 2023: 2022-10-01 to 2023-09-30
 
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USGS Water-Year Summary 2023
11422500 Bear River below Rollins Dam, near Colfax, CA
LOCATION - Lat 39°07'53", long 120°57'29" referenced to North American Datum of 1927, in SE 1/4 SW 1/4 sec.22, T.15 N., R.9 E., Nevada County, CA, Hydrologic Unit 18020126, on right bank, 10 ft upstream from Highway 174 bridge, 0.5 mi downstream from Rollins Dam, and 2.2 mi north of Colfax.
DRAINAGE AREA - 105 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - January 1912 to September 1913, October 1913 to July 1915 (gage heights and discharge measurements only), August 1915 to June 1917, November 1949 to September 1953, August 1964 to current year. Monthly discharge only for some periods, published in WSP 1315-A. Prior to August 1964, published as "Bear River near Colfax." Records for November and December 1911 include diversion to Bear River Canal and are not equivalent.
GAGE - Water-stage recorder and concrete control. Datum of gage is 1,927.41 ft above NGVD of 1929. Prior to Aug. 8, 1915, nonrecording gages at several sites above diversion dam 0.3 mi upstream at different datums. Aug. 8, 1915, to June 30, 1917, nonrecording gage 0.7 mi downstream at different datum. Nov. 1, 1949, to Sept. 30, 1953, at site 0.2 mi downstream at different datum. Aug. 17, 1964, to Feb. 4, 1986, at present site and datum. Feb. 5, 1986, to Mar. 19, 1987, at site 160 ft downstream at datum 8.00 ft lower.
COOPERATION - Records were collected by Nevada Irrigation District, under general supervision of the U.S. Geological Survey, in connection with Federal Energy Regulatory Commission project no. 2266.
REMARKS - Flow regulated by Rollins Reservoir (station 11421800) beginning Dec. 15, 1964. Bear River Canal (station 11422000) diverts upstream from station. See schematic diagram of Bear River Basin available from the California Water Science Center.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge (prior to construction of Rollins Dam in 1964), 9,620 ft³/s, Nov. 20, 1950, gage height, 21.40 ft, site and datum then in use, from rating curve extended above 3,600 ft³/s, on basis of slope-area measurement of peak flow; no flow at times in 1912, 1952. Maximum discharge since construction of Rollins Dam, 34,300 ft³/s, Jan. 2, 1997, gage height, 18.01 ft, maximum gage height, 20.62 ft, Feb. 17, 1986, site and datum then in use, from rating curve extended above 11,600 ft³/s; minimum daily, 0.5 ft³/s, Nov. 17, 1964.