Smith, Dwight A. Historic Highway Bridges of Oregon. Portland, Or.: Oregon Historical Society Press, 1989.
Smith, Dwight A. Columbia River Highway Historic District. Salem: Environmental Section, Technical Services Branch, Oregon State Highway Division, Oregon Department of Transportation, 1984.
Hadlow, Robert W. Historic Columbia River Highway Recording Project. Historic American Engineering Record, HABS/HAER Division, National Park Service, U.S. Dept. of the Interior, 1994.
Lancaster, Samuel C. The Columbia: American's Great Highway through the Cascade Mountains to the Sea. Third Edition. Portland: J.K. Gill Company, 1926.
State Capitol Reconstruction: The Capitol Reconstruction Record Group at the Oregon State Archives includes a great number of photographs, reports, studies, correspondence, plans, and related records pertinent to the subject. Newspaper articles are another good source of information.