USGS Water-Year Summary 2021
11480390 Mad River above Ruth Reservoir, near Forest Glen, CA
LOCATION - Lat 40°17'04", long 123°20'03" referenced to North American Datum of 1927, in NW 1/4 NE 1/4 sec.24, T.2 S., R.7 E., Trinity County, CA, Hydrologic Unit 18010102, in Six Rivers National Forest, on left bank, downstream side of Zenia Road Bridge, 500 ft downstream from unnamed creek, 0.4 mi downstream from Tompkins Creek, and 6.1 mi southwest of Forest Glen.
DRAINAGE AREA - 93.8 mi².
- WDR CA-80-2: Drainage area.
PERIOD OF RECORD - June 1980 to current year. Discharge measurements only September to December 1971, July 1972, June to September 1977.
GAGE - Water-stage recorder and crest-stage gage. Elevation of gage is 2,700 ft above NGVD of 1929, from topographic map. June 28 to Sept. 30, 1990, nonrecording gage 400 ft upstream at different datum.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 15,000 ft³/s, Feb. 17, 1986, gage height, 11.39 ft in gage, 12.94 ft from crest-stage gage, from rating curve extended above 5,000 ft³/s, maximum gage height, 14.12 ft, Dec. 30, 2005; no flow at times each year.