Skull Valley Road, then an unimproved dirt trail, was part of the Lincoln Highway from its creation in 1913 until about 1920, when an improved gravel road over Johnson Pass (present SR-199) was built with the help of a donation from Carl G. Fisher.[2] By the 1950s, Tooele County had constructed a paved county road through the valley.[3] In the early 1990s, the Skull Valley Band of Goshute Indians began planning a nuclear waste storage facility in Skull Valley.[4] At the urging of Governor Mike Leavitt, the Utah Transportation Commission added the road to the state highway system in January 1998 as SR-196, and in February the state legislature concurred and added the new route to the highway code.[5][6] Signs were posted in March prohibiting transport of high-level nuclear waste on the new state highway except by permit.[7] The next year, the commission designated two "statewide public safety interest highways" - State Routes 900 and 901 - each consisting of several low-quality Bureau of Land Management and county-maintained roadways branching off I-80 and SR-196, respectively. Unlike a typical state highway, the roads were not to be improved to higher standards; the purpose of the designation was to prevent construction of a waste-carrying rail line branching off the Union Pacific Railroad's Shafter Subdivision (ex-Western Pacific Railroad), which would cross these roads.[8][9][10]