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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.
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USGS Water-Year Summary 2024
11525630 Grass Valley Creek near Lewiston, CA
LOCATION - Lat 40°41'12", long 122°51'36" referenced to North American Datum of 1927, in NW 1/4 SW 1/4 sec.26, T.33 N., R.9 W., Trinity County, CA, Hydrologic Unit 18010211, on right bank, 0.2 mi downstream from unnamed tributary, 0.5 mi upstream from the confluence with Trinity River, and 3.2 mi southwest of Lewiston.
DRAINAGE AREA - 36.2 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 2004 to September 2019 (discontinued).
SEDIMENT DATA: Water years 2003-06.
SEDIMENT DATA: Water years 2003-06.
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 1,680 ft above NGVD of 1929.
REMARKS - Minor regulation by Buckhorn Reservoir since 1990, capacity, 1,090 acre-ft; small pumping diversions upstream from station. See schematic diagram of Klamath River and Trinity River Basins available from the California Water Science Center.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 1,150 ft³/s, Dec. 2, 2012, gage height, 6.10 ft, maximum gage height, 8.06 ft, February 27, 2019; minimum daily, 4.9 ft³/s, Aug. 1-3, 2014, and Sep. 10-11, 2015.
