USGS Water-Year Summary 2024
14219950 LAKE MERWIN NEAR CHELATCHIE, WA
LOCATION - Lat 45°58'17", long 122°23'02" referenced to North American Datum of 1927, in NW 1/4 SW 1/4 sec.25, T.6 N., R.3 E., Cowlitz County, WA, Hydrologic Unit 17080002, on the east end of Lake Merwin, 8 mi NE of Amboy, 8 mi SW of Cougar.
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 2017 to current year. (February 2010 to September 2017 are unpublished, data available in files of Washington Water Science Center.)
GAGE - Water-stage recorder. Datum of gage is NGVD of 1929.
COOPERATION - Gage is on the property of and in cooperation with Pacificorp.
EXTREMES FOR PERIOD OF RECORD - (Since Water Year 2018) Maximum elevation, 239.68 ft, Apr. 20, 2019; minimum elevation, 227.60 ft, Nov. 13, 2018.