USGS Water-Year Summary 2020
14233500 COWLITZ RIVER NEAR KOSMOS, WA
LOCATION - Lat 46°27'59", long 122°06'28" referenced to North American Datum of 1927, in NE 1/4 SW 1/4 sec.06, T.11 N., R.6 E., Lewis County, WA, Hydrologic Unit 17080005, at Cowlitz Falls Dam, 1.1 mi downstream from Cispus River, 8 mi southwest of Randle, 4.5 mi southeast of Kosmos.
DRAINAGE AREA - 1,040 mi².
PERIOD OF RECORD - October 1947 to current year. October 1967 to March 1994, published as "14233400 Cowlitz River near Randle."
GAGE - Discharge determined from flow through turbines and outlet structures of Cowlitz Falls Dam. Prior to December 1948, nonrecording gage at site 0.3 mi downstream. December 1948 to September 1967, water-stage recorder at site 0.8 mi downstream, at datum 760.96 ft above sea level. October 1967 to March 1994, water-stage recorder, at site 0.6 mi upstream, at datum 799.42 ft above NGVD of 1929.
COOPERATION - Records provided by Lewis County Public Utility District since Mar. 8, 1994.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 103,000 ft³/s, Feb. 9, 1996; no flow part or all of many days 1994-2012 water years.