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Lake Merwin
Aerial view of Lake Merwin in Washington (35085174512).jpg
Aerial view of Lake Merwin
Location of Lake Merwin in Washington, USA.
Location of Lake Merwin in Washington, USA.
Lake Merwin
Location in Washington (state)
Location of Lake Merwin in Washington, USA.
Location of Lake Merwin in Washington, USA.
Lake Merwin
Location in the United States
Location Clark / Cowlitz counties, Washington, United States
Coordinates 45°59′N 122°28′W / 45.983°N 122.467°W / 45.983; -122.467
Type reservoir
Primary inflows Lewis River
Primary outflows Lewis River
Catchment area 731 square miles (1,890 km2)
Basin countries United States
Surface area 3,921 acres (15.9 km2)
Max. depth 190 m (620 ft)
Water volume 422,400 acre-feet (0.521 km3)
Shore length1 32 mi (51 km)
1 Shore length is not a well-defined measure.

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.

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