Utah Department of Transportation. "Utah National Highway System" (Map). UDOT Data Portal. Utah Department of Transportation. Retrieved January 22, 2019.
broermapsonline.org
H.M. Gousha Company (1967). "Northern Rockies" (Map). Road Atlas. H.M. Gousha Company. p. 42. Retrieved January 27, 2008 – via Broer Map Library.
byu.edu
contentdm.lib.byu.edu
United States Geological Survey (1958). State of Utah (Topographic map). 1:1,800,000. Reston, Virginia: United States Geological Survey – via BYU Library Digital Collections.
"US 91 Main Route"(PDF). Idaho Transportation Department Milepost Log State Highway System. Idaho Transportation Department. August 26, 2011. Retrieved June 10, 2012.
"Interstate 15 Main Route"(PDF). Idaho Transportation Department Milepost Log State Highway System. Idaho Transportation Department. August 26, 2011. Retrieved June 10, 2012.