ODOT Transportation Data Section and Transportation Systems Monitoring Unit (November 2017). "2016 Transportation Volume Tables"(PDF). Oregon Department of Transportation. pp. 17, 34–35, 41–42. Retrieved June 18, 2018.
Road Inventory and Classification Services Unit. "Straightline Charts". Transportation Development Division, Oregon Department of Transportation. Retrieved September 22, 2016.
Burrow, Rebecca; Bell, Chris; Leedham, Chris (2013). Oregon's Historic Bridge Field Guide(PDF). Oregon Department of Transportation. p. 95. OCLC862507884. Retrieved June 18, 2018 – via Oregon State Library.
"Respect the Emigrant Hill". Oregon Department of Transportation. April 2003. Retrieved June 18, 2018 – via Oregon State Library.
Burrow, Rebecca; Bell, Chris; Leedham, Chris (2013). Oregon's Historic Bridge Field Guide(PDF). Oregon Department of Transportation. p. 95. OCLC862507884. Retrieved June 18, 2018 – via Oregon State Library.