{{Use American English|date=July 2025}} {{Use mdy dates|date=February 2025}} {{Infobox body of water | name = Lake Merwin | image = Aerial view of Lake Merwin in Washington (35085174512).jpg | caption = Aerial view of Lake Merwin | image_bathymetry = | caption_bathymetry = | location = Clark / Cowlitz counties, Washington | coords = {{coord|45|59|N|122|28|W|type:waterbody_region:US|display=inline,title}}<ref name="gnis"/> | type = reservoir | inflow = Lewis River | outflow = Lewis River | catchment = {{convert|731|sqmi|km2|sigfig=3}}<ref name="npdp"/> | basin_countries = United States | length = | width = | area = {{convert|3921|acre|km2|sigfig=3}}<ref name="npdp"/> | depth = | max-depth = {{convert|190|ft|abbr=on}}<ref name="Merwin Lake -- Clark County">{{cite web|title=Merwin Lake -- Clark County|url=http://www.ecy.wa.gov/programs/eap/lakes/wq/docs/lkmercl1.html|publisher=Department of Ecology, State of Washington|accessdate= 20 December 2014}}</ref> | volume = {{convert|422,400|acre.ft|km3|sigfig=3|lk=in}}<ref>{{cite web|title=Reservoirs in the United States| url=https://pubs.usgs.gov/wsp/1838/report.pdf| publisher= United States Geological Survey | accessdate = 20 December 2014}}</ref> | residence_time = | shore = {{convert|32|mi|abbr=on}}<ref name="Merwin Lake -- Clark County"/> | elevation = {{convert|72|m|abbr=on|order=flip}}<ref name=gnis/> | islands = | cities = <!-- Map --> | pushpin_map = Washington#USA | pushpin_label_position = | pushpin_map_alt = Location of Lake Merwin in Washington, USA. | pushpin_map_caption = <!-- Below --> | website = | reference = <ref name="gnis">{{GNIS|1523015|Lake Merwin}}</ref><ref name="npdp">[http://npdp.stanford.edu/DamDirectory/DamDetail.jsp?npdp_id=WA00149 Merwin Dam] {{webarchive|url=https://web.archive.org/web/20110716112357/http://npdp.stanford.edu/DamDirectory/DamDetail.jsp?npdp_id=WA00149 |date=2011-07-16 }}, NPDP Dam Directory</ref> }} '''Lake Merwin''' is a reservoir on the Lewis River in the U.S. state of Washington. It lies on the border between Clark County and Cowlitz County. It was created in 1931 with the construction of Merwin Dam.<ref name="npdp"/>
==See also== *List of lakes in Washington (state) *List of dams in the Columbia River watershed
== References == {{reflist}}
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{{DEFAULTSORT:Merwin}} Category:Reservoirs in Washington (state) Category:Lakes of Clark County, Washington Category:Lakes of Cowlitz County, Washington Category:Protected areas of Clark County, Washington Category:Protected areas of Cowlitz County, Washington
{{ClarkCountyWA-geo-stub}} {{CowlitzCountyWA-geo-stub}}