Kosmos is an unincorporated community in Washington, United States. It was established in 1904 with a grocery store and a post office. Kosmos reached its heyday in the 1940s, when mills and logging camps dotted the landscape. Kosmos was abandoned in 1968 when the Mossyrock Dam was completed. The Cowlitz River rose behind the dam, forming Riffe Lake, which completely submerged the town of Kosmos. The remains of the town are periodically exposed when the lake recedes during regional droughts.[1]
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