Long Lake Dam is a concrete gravity dam on the Spokane River, between Lincoln County and Stevens County about 30 miles northwest of Spokane in eastern Washington. It forms Long Lake, a 23.5 mi long reservoir, and has a hydroelectric generating capacity of 71 megawatts. The dam was built by Washington Water Power, which operates five other dams al…Long Lake Dam is a concrete gravity dam on the Spokane River, between Lincoln County and Stevens County about 30 miles northwest of Spokane in eastern Washington. It forms Long Lake, a 23.5 mi long reservoir, and has a hydroelectric generating capacity of 71 megawatts. The dam was built by Washington Water Power, which operates five other dams along the Spokane.
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