The Nine Mile Hydroelectric Power Plant Historic District is the main attraction, comprised of the Nine Mile Dam, completed in 1908 to supply power to the 130-mile-long electric railway system of the Spokane & Inland Empire Railroad Company, and a series of brick cottages that were built to house power plant personnel. The district is listed on the National Register of Historic Places and Washington Heritage Register.
Washington Water Power purchased the development in 1925, and the brick cottages, constructed just northwest of the dam, were built between 1928 and 1930. In addition to Nine Mile Dam and worker cottages, there are some additional sites to note.