Bridges of the Spokane, Portland and Seattle Railway Company, 1906-1967 MPS (NRIS 100003277)

• Spokane, Portland and Seattle Railway Company-Box Canyon Viaduct (Windust)
• Spokane, Portland and Seattle Railway Company Bridge 291.4-O.W.R.&N. Crossing-Washtucna (Washtucna)
• Spokane, Portland and Seattle Railway Company-Cow Creek Viaduct (Ankeny)

National Park Service documentation: https://npgallery.nps.gov/AssetDetail/NRIS/100003277