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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
11526400 Trinity River above North Fork Trinity River, near Helena, CA
LOCATION - Lat 40°46'00", long 123°06'48" referenced to North American Datum of 1927, in SW 1/4 SE 1/4 sec.28, T.34 N., R.11 W., Trinity County, CA, Hydrologic Unit 18010211, on right bank, 400 ft upstream from Pear Tree Gulch, 0.8 mi upstream from North Fork Trinity River, and 1.4 mi southeast of Helena.
DRAINAGE AREA - 1,137 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - March 2005 to current year.
GAGE - Water stage recorder and crest-stage gage. Datum of gage is 1,356.59 ft above NAVD of 1988.
REMARKS - Flow regulated by Trinity Lake (11525400) and transbasin diversion to Judge Francis Carr powerplant (station 11525430). Small diversion for irrigation 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, 28,800 ft³/s, Dec. 31, 2005, gage height, 25.97 ft; minimum daily, 288 ft³/s, Oct. 25, 2015.
WATER-QUALITY RECORDS
PERIOD OF RECORD -
CONTINUOUS WATER-QUALITY DATA:
CONTINUOUS WATER-QUALITY DATA:
WATER TEMPERATURE: Water years October 1, 2019 to current year.
