USGS Water-Year Summary 2024

11516530 Klamath River below Iron Gate Dam, CA

LOCATION - Lat 41°55'41", long 122°26'35" referenced to North American Datum of 1927, in SE 1/4 NE 1/4 sec.17, T.47 N., R.5 W., Siskiyou County, CA, Hydrologic Unit 18010206, Mt. Diablo Meridian, on left bank, 0.1 mi downstream from Bogus Creek, 0.5 mi downstream from the old Iron Gate Dam location, and 6 mi northeast of Hornbrook.

DRAINAGE AREA - 4,630 mi². approximately (not including Lost River, Butte Creek, or Lower Klamath Lake Basins).

SURFACE-WATER RECORDS

PERIOD OF RECORD - October 1960 to current year. 

GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 2,162.44 ft above NGVD of 1929 (levels by PacifiCorp, formerly Pacific Power and Light Co.).

REMARKS - Flow regulated by Upper Klamath Lake, capacity, 523,700 acre-ft; Records collected in connection with Federal Energy Regulatory Commission (FERC) project no. 2082. See schematic diagram of Klamath River and Trinity River Basins available from the California Water Science Center.

EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 29,400 ft³/s, Dec. 22, 1964, gage height, 13.63 ft, from rating curve extended above 15,000 ft³/s on basis of slope-area measurement of peak flow; minimum daily, 389 ft³/s, Aug. 25-28, 1992.

WATER-QUALITY RECORDS

PERIOD OF RECORD -

DISCRETE WATER-QUALITY DATA:
CHEMICAL DATA: Water years 1962-81, 2002-04 (seasonal records only).
SUSPENDED-SEDIMENT : April 2018 to current year.

CONTINUOUS WATER-QUALITY DATA:
PRECIPITATION: Water years 1999-2001
DISSOLVED OXYGEN: Water years 1999-2001, 2002-03 (seasonal records only).
pH: Water years 1999-2001, 2002-03 (seasonal records only).
SPECIFIC CONDUCTANCE: Water years 1999-2001, 2002-03 (seasonal records only).
AIR TEMPERATURE: Water years 1999-2001.
WATER TEMPERATURE: Water years 1962-80, 1999-2001, 2002-03 (seasonal records only).
TURBIDITY: June 2019 to current year (seasonal records only until commencement of dam removal).