USGS Water-Year Summary 2021
11480400 Ruth Reservoir near Forest Glen, CA
LOCATION - Lat 40°22'08", long 123°25'56" referenced to North American Datum of 1927, in NW 1/4 NW 1/4 sec.19, T.1 S., R.7 E., Trinity County, CA, Hydrologic Unit 18010102, in Six Rivers National Forest, near center of Robert W. Matthews Dam on Mad River, and 5.6 mi west of Forest Glen.
DRAINAGE AREA - 121 mi².
PERIOD OF RECORD - October 1966 to current year. Records prior to October 1966 in files of Humboldt Bay Municipal Water District.
GAGE - Crest-stage gage. Datum of gage is NGVD of 1929 (levels by Humboldt Bay Municipal Water District).
COOPERATION - Since Apr. 1, 2004, records provided by Humboldt Bay Municipal Water District, under general supervision of the U.S. Geological Survey. Contents not rounded to U.S. Geological Survey standards.
EXTREMES FOR PERIOD OF RECORD - Maximum contents, 68,000 acre-ft, Feb. 17, 1986, elevation, 2,667.06 ft; minimum, 11,700 acre-ft, Oct. 24-28, 1977; minimum elevation, 2,607.13 ft, Oct. 28, 1977.