Washington State Legislature (1943). "Chapter 147". Session Laws of the State of Washington (1943 ed.). Olympia, Washington: Washington State Legislature. Retrieved November 9, 2008.
Official State Highway Map(PDF) (Map) (2008-2009 ed.). 1:842,000. Official State Highway Maps. Cartography by U.S. Geological Survey. Olympia, Washington: Washington State Department of Transportation. 2008. ยง G2. Retrieved November 9, 2008.