Interstate 15 South - Idaho Falls to Blackfoot

The preferred alternative for the realignment of the freeway along U.S. 20 will tie into Interstate 15 west by 49th North.
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U.S. 20 constitutes a freeway or expressway extending northeast from Idaho Falls to St. Anthony.
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A parclo interchange joins Interstate 15 with Grandview Drive west to Idaho Falls Regional Airport (IDA) and U.S. 20 east ahead of Lindsay Boulevard.
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Business Loop I-15 separates from I-15 at the succeeding exit south of Grandview Drive where U.S. 20 continues west to Arco.
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U.S. 20 east to Riverside Drive south leads to Downtown Idaho Falls. U.S. 20 travels to West Yellowstone, Montana ahead of Yellowstone National Park.
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U.S. 20 overlaps with I-15 south to the parclo interchange (Exit 118) with W Broadway Street and Business Loop I-15/U.S. 20 Business east to U.S. 26 in Downtown Idaho Falls.
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Business Loop I-15 returns to I-15 from Idaho Falls alongside U.S. 26 west on Sunnyside Road to Exit 116.
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Business Loop I-15/U.S. 26 east cross the Snake River ahead of the north end of U.S. 91 and turn onto Yellowstone Highway north.
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1250 N east to Shelley was formerly part of U.S. 26 between Exit 113 and U.S. 91 (State Street).
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U.S. 26 parts ways with Interstate 15 at Exit 93, where Business Loop I-15 branches southeast into the city of Blackfoot.
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U.S. 26 travels northwest from Blackfoot to Arco. ID 93 loops 51.21 miles west from U.S. 26 nearby to Aberdeen and Business Loop I-86 in American Falls.
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Photo Credits:
- ABRoads: 08/09/16
- Alex Nitzman: 07/07/16
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Page Updated Wednesday April 01, 2026.


