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Welcome to Friends of the Centennial Trail Friends of the Centennial Trail advocate for maintenance and completion of the Spokane River Centennial Trail connecting trails and adjacent park lands. This 64mile State Park twostate National Recreation Trail is a treasure for Inland Northwest residents and visitors. Over 40 miles in eastern Washington span from the WAID state line through Liberty Lake Spokane Valley Spokane Riverside State Park and Nine Mile Falls Washington. Heading east from the state line 24 miles extend through Post Falls and Coeur dAlene Idaho.