Idaho State Highway 51 Idaho State Highway 51 State Highway 51 (SH-51) is a state highway in southwestern Idaho from Mountain Home south to the Nevada border, where it continues as State Route 225 to Elko. It is the major north–south road in Owyhee County. As currently configured in the state's official milepoint log, SH-51 terminates at the BL-84 intersection with American Legion Blvd., and is not otherwise officially concurrent/overlaid with BL-84 (where the signs at I-84's Exits 90 and 99 say "To SH-51/To SH-67") or the former section of US-20 that follows American Legion Blvd. to I-84/US-20 east at Exit 95. As of
U.S. Route 51 in Kentucky U.S. Route 51 in Kentucky U.S. Route 51 (US 51) in Kentucky runs through the western portion of the state from the Tennessee state line at Fulton to the Illinois state line at Cairo, Illinois. It is a mostly rural route, also serving the towns of Clinton, Arlington, Bardwell and Wickliffe. It also carries part of the Great River Road near the northern end of its route in Kentucky. US 51 mainly runs through the Jackson Purchase region of Kentucky, spanning the four westernmost counties in Kentucky, beginning with a four-lane section crossing the state line, which begins a concurrency