Idaho State Highway 81
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| Route information | |
| Maintained by ITD | |
| Length: | 33.978 mi (54.682 km) |
| Existed: | 1972 – present |
| Major junctions | |
| South end: |
 SH 77 in Malta
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SH 77 in Declo
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| North end: |
 US 30 in Burley
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| Location | |
| Counties: | Cassia |
| Highway system | |
→
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| Location: | near Idahome, Idaho |
| Length: | 0.337 mi (0.542 km) |
| Existed: | 1972–present |
State Highway 81 (SH-81) is a state highway in Cassia County, Idaho. The highway runs for 33.978 miles (54.682 km) from SH-77 in Malta to U.S. Route 30 (US-30) in Burley. It also has a short spur route connecting the highway to Interstate 84 at the Yale Interchange.
Prior to its designation as SH-81 in 1972, the highway was part of U.S. Route 30S (US-30S), a multi-state national highway that traveled from Burley to Granger, Wyoming.
State Highway 81 begins at an intersection with SH-77 in Malta, located north of the Utah state line. The highway travels north, following the eastern foothills of the Cotterell Mountains and the Raft River valley, through Idahome to Interstate 84, which it parallels for several miles heading northwest. SH-81 completes its turn west and heads towards Declo, intersecting SH-77. The highway continues west along the southern side of the Snake River, parallel to the Eastern Idaho Railroad. It terminates at an intersection with US-30 (co-signed with Interstate 84 Business) south of Burley Municipal Airport on the banks of the Snake River, just east of downtown Burley.
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