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Riffe Lake
Riffe Lake.jpg
Location Lewis County, Washington, United States
Type reservoir
Primary inflows Cowlitz River
Primary outflows Cowlitz River
Catchment area 1,400 sq mi (3,630 km2)
Basin countries United States
Max. length 23.5 mi (37.8 km)
Surface area 11,830 acres (47.9 km2)
Max. depth 360 feet (110 m)
Shore length1 52 mi (83.7 km)
Surface elevation 778.5 ft (237 m)
1 Shore length is not a well-defined measure.

Riffe Lake is a 23.5 mi (38 km) long reservoir on the Cowlitz River in the U.S. state of Washington. Originally named Mossyrock Lake, then later Davisson Lake, it was created in 1968 with the construction of Mossyrock Dam by Tacoma Power. The lake was renamed in 1976 after the community of Riffe, which was inundated by the lake. The residents of Kosmos, Washington were also relocated as the lake's water level would submerge much of the town.

The lake contains species of fish including rainbow and brown trout, landlocked coho, bass both large mouth and small mouth, bluegill, crappie, and perch.

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