Idaho State Highway 75
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| Route information | |
| Maintained by ITD | |
| Length: | 170.666 mi (274.660 km) |
| Tourist routes: |
 Salmon River Scenic Byway(Stanley to Challis) |
| Major junctions | |
| South end: |
  US 93 / US 26 in Shoshone
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 SH 21 at Stanley
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| North end: |
US 93 in Challis
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| Location | |
| Counties: | Lincoln, Blaine, and Custer counties |
| Highway system | |
→
Sawtooth Scenic Byway
(Shoshone to Stanley)
US 20 near Stanton Crossing
State Highway 75 is a two-lane highway 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. It primarily follows the Big Wood River in the south and the main Salmon River in the north, divided by Galena Summit.
State Highway 75 begins at a junction with US-93 on Greenwood Street in Shoshone at an elevation of just under 4,000 feet (1,220 m) above sea level. The highway heads northward, and ascends the Big Wood River valley, into Blaine County, past the Magic Reservoir to the west and crosses US-20 at Timmerman Junction at 4,884 feet (1,489 m).
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Wikipedia