USGS Water-Year Summary 2019
14234800 RIFFE LAKE NEAR MOSSYROCK, WA
LOCATION - Lat 46°32'07", long 122°25'25" referenced to North American Datum of 1927, in SW 1/4 SW 1/4 sec.10, T.12 N., R.3 E., Lewis County, WA, Hydrologic Unit 17080005, in emergency generator room on top of Mossyrock Dam on Cowlitz River, 2.8 mi east of Mossyrock, and at mile 65.5.
DRAINAGE AREA - 1,154 mi².
- WDR WA-74-1: 1973.
PERIOD OF RECORD - April 1968 to current year.
GAGE - Water-stage recorder; nonrecording gage prior to July 25, 1968. Datum of gage is NGVD of 1929 (levels by City of Tacoma).
EXTREMES FOR PERIOD OF RECORD - Maximum contents, 1,686,300 acre-ft, July 31, 1972, elevation, 778.63 ft; minimum contents since normal low operating level was attained, 517,233 acre-ft, Mar. 9, 2001, elevation, 644.93 ft.