2016 Annual Traffic Report(PDF) (Report). Washington State Department of Transportation. 2017. pp. 187–188. Archived from the original(PDF) on August 12, 2017. Retrieved August 19, 2018.
Prahl, C. G. (December 1, 1965). "Identification of State Highways"(PDF). Washington State Highway Commission. Archived from the original(PDF) on February 17, 2017. Retrieved August 19, 2018.
Washington State Department of Transportation (2004). Washington State Highways, 2004–2005(PDF) (Map). 1:842,000. Olympia: Washington State Department of Transportation. Vancouver inset. Archived from the original(PDF) on September 24, 2021. Retrieved December 27, 2018.
2016 Annual Traffic Report(PDF) (Report). Washington State Department of Transportation. 2017. pp. 187–188. Archived from the original(PDF) on August 12, 2017. Retrieved August 19, 2018.
Prahl, C. G. (December 1, 1965). "Identification of State Highways"(PDF). Washington State Highway Commission. Archived from the original(PDF) on February 17, 2017. Retrieved August 19, 2018.
Washington State Department of Transportation (2004). Washington State Highways, 2004–2005(PDF) (Map). 1:842,000. Olympia: Washington State Department of Transportation. Vancouver inset. Archived from the original(PDF) on September 24, 2021. Retrieved December 27, 2018.