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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.
- For water years 2006 through 2013, choose a water year and an Annual Water Data Report will be provided.
- For water years 2005 and earlier, Annual Water Data Reports may be available in digital format.
- Not all sites have reports available for every water year.
USGS Water-Year Summary 2024
11421900 Rollins Powerhouse near Colfax, CA
LOCATION - Lat 39°08'04", long 120°57'09" referenced to North American Datum of 1927, Placer County, CA, Hydrologic Unit 18020126, in powerplant at base of Rollins Dam, 100 ft upstream from diversion dam and 2.2 mi north of Colfax.
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1986 to current year. Unpublished data for water years 1981-86 available in the files of the U.S. Geological Survey.
GAGE - Discharge computed based on electrical power generation and the head. Elevation of powerplant is 1,950 ft above NGVD of 1929, from topographic map.
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 - Previously published as a monthly line item with station Rollins Reservoir near Colfax, CA (11421800).
