On September 20, 2014, Idaho State Historian Keith C. Petersen led a Latah County Historical Society group on a guided tour of parts of the Mullan Road. May 6, 2014 Petersen released his new book, John Mullan: The Tumultuous Life of a Western Road Builder. His book chronicles the life of John Mullan, a man well known in the Pacific Northwest for his role as architect and builder of the military road between Fort Walla Walla, Washington and Fort Benton, Montana. The book cover