Idaho State Highway 75

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.

State Highway 75

Route information
Maintained by ITD
Length170.666 mi (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
Major intersections US 20 near Stanton Crossing
SH-21 at Stanley
North end US 93 near Challis
Location
CountryUnited States
StateIdaho
CountiesLincoln, Blaine, Custer
Highway system
  • Idaho State Highway System
  • Interstate
  • US
  • State
SH-74 SH-77
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