The Palouse Scenic Byway was designated on April 17, 2003 on sections of SR 26, SR 27, US 195 and SR 271 in Whitman County.[2] SR 278 was added to the byway in 2011.[3]
^Washington State Legislature (April 20, 2011). "Chapter 123: Scenic and Recreational Highway System"(PDF). 2011 Session Laws of the State of Washington. Session Laws of the State of Washington (2011 ed.). Olympia, Washington: Washington State Legislature. OCLC42336168. Retrieved October 16, 2014.