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
Texas State Highway 51 SH 51 was designated on January 29, 1974; its routing has remained unchanged. Texas State Highway 51 Texas State Highway 51 (SH 51) is a short state highway located entirely in Hansford County, Texas, just south of Spearman. SH 51 begins at SH 207 southeast of Spearman and travels east through unincorporated Hansford County approximately . It is a two-lane route for its entire length, and has no intersections with other state-maintained routes until its terminus at FM 281, which continues to the east and south, and FM 760, which travels north to Spearman. The original SH 51 was designated