| Lake Merwin | |
|---|---|
| Location | Clark / Cowlitz counties, Washington, USA |
| Coordinates | [1] |
| Lake type | reservoir |
| Primary inflows | Lewis River |
| Primary outflows | Lewis River |
| Catchment area | 731 square miles (1,890 km2)[2] |
| Basin countries | United States |
| Surface area | 3,921 acres (15.9 km2)[2] |
| References | [1][2] |
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.[2]