"Chapter 116". Session Laws of the State of Washington (1897 ed.). Olympia, Washington: Washington State Legislature. March 18, 1897. pp. 342–345. Retrieved November 6, 2010.
"Chapter 7". Session Laws of the State of Washington (1905 ed.). Olympia, Washington: Washington State Legislature. January 26, 1905. p. 20. Retrieved November 6, 2010.
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"Chapter 151". Session Laws of the State of Washington (1907 ed.). Olympia, Washington: Washington State Legislature. March 13, 1907. pp. 309–310. Retrieved November 6, 2010.
"Chapter 65". Session Laws of the State of Washington (1913 ed.). Olympia, Washington: Washington State Legislature. March 12, 1913. pp. 221–223. Retrieved November 6, 2010.
"Chapter 110". Session Laws of the State of Washington (1919 ed.). Olympia, Washington: Washington State Legislature. March 14, 1919. pp. 268–269. Retrieved November 6, 2010.
"Chapter 32". Session Laws of the State of Washington (1921 ed.). Olympia, Washington: Washington State Legislature. March 2, 1921. p. 118. Retrieved November 6, 2010.
"Chapter 185". Session Laws of the State of Washington (1923 ed.). Olympia, Washington: Washington State Legislature. March 19, 1923. pp. 627–630, 632. Retrieved November 6, 2010.
"Chapter 190". Session Laws of the State of Washington (1937 ed.). Olympia, Washington: Washington State Legislature. March 17, 1973. pp. 933–938. Retrieved November 6, 2010.
Washington State Rail System(PDF) (Map). Washington State Department of Transportation. 2008. Archived from the original(PDF) on January 5, 2011. Retrieved October 21, 2009.
Amtrak Cascades Route (Map). Washington State Department of Transportation. 2009. Retrieved October 21, 2009.
Washington State Department of Transportation (2008). "2008 Annual Traffic Report"(PDF). Archived from the original(PDF) on June 16, 2010. Retrieved October 21, 2009.
Washington State Highway Commission (1970). "Annual Traffic Report"(PDF). Archived from the original(PDF) on June 25, 2008. Retrieved November 6, 2010.
Washington State Rail System(PDF) (Map). Washington State Department of Transportation. 2008. Archived from the original(PDF) on January 5, 2011. Retrieved October 21, 2009.
Washington State Department of Transportation (2008). "2008 Annual Traffic Report"(PDF). Archived from the original(PDF) on June 16, 2010. Retrieved October 21, 2009.
Washington State Highway Commission (1970). "Annual Traffic Report"(PDF). Archived from the original(PDF) on June 25, 2008. Retrieved November 6, 2010.