Nine Mile Dam

Nine Mile Falls Dam is a dam on the Spokane River, in the unincorporated community of Nine Mile Falls, Washington. It was built on the site of the falls in 1908, creating Nine Mile Reservoir. The dam was designed by the New York engineering firm of Sanderson & Porter, and originally constructed to satisfy the power needs of the Spokane and Inland Empire Railroad interurban trolley lines.[2]

Nine Mile Hydroelectric Power Plant Historic District
U.S. National Register of Historic Places
U.S. Historic district
Nine Mile Dam Location in Washington Show map of Washington (state) Nine Mile Dam Location in the United States Show map of the United States
Nearest city	Nine Mile Falls, Washington
Area	less than one acre
Built	1906 (1906)
Architect	Sanderson & Porter; Zimmerman, William F.
Architectural style	Bungalow/American Craftsman, vernacular industrial
MPS	Hydroelectric Power Plants in Washington State, 1890--1938 MPS
NRHP reference No.	90001861[1]
Added to NRHP	December 6, 1990

Washington Water Power (now the power company Avista) purchased the site in 1925, and continues to operate it as one of its six hydroelectric generating plants on the Spokane River. The 58-foot-high cyclopean masonry dam and its powerhouse, storehouse, ten cottages and other structures were placed on the National Register of Historic Places in 1990.[3]