Idaho State Highway 51
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| Route information | |
| Maintained by ITD | |
| Length: | 93.598 mi (150.631 km) |
| Major junctions | |
| South end: |
 SR 225 near Owyhee, NV
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 SH-67
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| North end: |
 I-84 Business Loop at intersection with American Legion Blvd. in Mountain Home
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| Location | |
| Counties: | Owyhee, Elmore |
| Highway system | |
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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 February 2015, some map products such as Google Maps still show SH-51's former overlay with American Legion Blvd.
SH-51's northern is in the city of Mountain Home in Elmore County. After turning south from Airbase Rd. and the intersection with SH-67, the road crosses the Snake River into Owyhee County and passes through the towns of Bruneau, Grasmere, and Riddle. About 11.5 miles (18.5 km) from the state border it enters the Duck Valley Indian Reservation.
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