Lake Cushman, lake and reservoir in Washington, United States

Lake Cushman is a large body of water in Mason County, Washington, with clear water surrounded by dense forests of hemlock, fir, and cedar. The lake stretches about ten miles with depths reaching around one hundred feet, and its shoreline features smooth, round rocks mixed with rocky outcroppings.

The lake began as a narrow broadening of the Skokomish River, formed in a glacial trough and dammed by a terminal moraine from the Vashon Glaciation. The Skokomish, a subgroup of the Twana, lived around it, with a village near today's Skokomish Park at what was then the lake's southern end. The City of Tacoma built Cushman Dam No. 1, enlarging the lake; the rising water flooded the Antlers Hotel, a two-story tourist stop built in 1889, in 1925.

The lake is named after Orrington Cushman, who interpreted for Governor Isaac Stevens during the 1854 Treaty of Point Elliott negotiations with Puget Sound peoples. The Twana, a subgroup of the Skokomish, call the lake ʔiluʔəɬ, a name also used for nearby Mount Washington.

The lake offers several access points and activities for visitors, including boat launch ramps at Skokomish Park and numerous trails in the surrounding area. The clear water allows for boating and water activities, though visitors should avoid rocky areas when navigating to prevent boat damage.

The Antlers Hotel, a two-story resort built in 1889, was submerged in 1925 when the rising water of Cushman Dam No. 1 flooded the property. Divers and visitors have since searched the lake bed for its remains. The hotel once drew Seattle tourists who reached Hoodsport by steamship and continued by stagecoach.