 State Highway 75 | ||||
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| Route information | ||||
| Maintained by ITD | ||||
| Length | 170.666 mi[1] (274.660 km) | |||
| Tourist routes |  Sawtooth Scenic Byway(Shoshone to Stanley) Salmon River Scenic Byway(Stanley to Challis) | |||
| Major junctions | ||||
| South end |   US 93 / US 26 in Shoshone | |||
 US 20 near Stanton Crossing SH-21 at Stanley | ||||
| North end | US 93 near Challis | |||
| Location | ||||
| Country | United States | |||
| State | Idaho | |||
| Counties | Lincoln, Blaine, Custer | |||
| Highway system | ||||
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from Boundary Creek
from Lower Stanley
State Highway 75 is a two-lane highway in the western United States that travels through the Sawtooth Valley of central Idaho. The highway's southern terminus is in Shoshone, and its northern is near Challis. It is designated as one of Idaho's scenic byways and provides access to Sawtooth National Recreation Area and primarily follows the Big Wood River in the south and the main Salmon River in the north, divided by Galena Summit.