Idaho State Highway 81

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State Highway 81

Route information
Maintained by ITD
Length33.978 mi[1] (54.682 km)
Major junctions
South end SH-77 in Malta
Major intersections SH-77 in Declo
North end US 30 in Burley
CountryUnited States
Highway system
  • Idaho State Highway System
SH-79 I-84

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 (I-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.[2]

Route description

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.[1][3]


U.S. Route 30S, which traveled from Burley to Granger, Wyoming via Logan, Utah, was established in 1926 as an alternative route to U.S. Route 30N.[4] It was moved to the completed Interstate 80N (later I-84) in 1970,[5] and decommissioned entirely in 1972.[6] SH-81 was established by the Idaho State Board of Highway Directors on September 12, 1972, to preserve state maintenance of the highway between Burley and the Utah state line.[2][7]

In 1983, the Idaho Transportation Board studied an extension of SH-81 from Burley to Twin Falls to replace an existing section of US 30.[8] It was later truncated in the early 1990s to its current terminus at SH-77 in Malta.

Major intersections

The entire route is in Cassia County.

SH-77 north (Center Street) – Albion

SH-81 Spur (Yale Road) to I-84
SH-77 (Clark Street) to I-84 – Albion, Rupert
Burley33.97854.682 US 30 / I-84 BL – Burley, Heyburn
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

Spur route

Spur plate.svg

State Highway 81 Spur

Locationnear Idahome, Idaho
Length0.337 mi[1] (542 m)

ID-81 has a spur route connecting the main highway to Interstate 84, traveling 0.337 miles (0.542 km) east along Yale Road to the Yale Interchange.[1][3]


  1. ^ a b c d e "Milepoint Log: State Highway 81" (PDF). Idaho Transportation Department. January 26, 2016. Retrieved February 17, 2017.
  2. ^ a b c "Minutes of the Regular Meeting of the Idaho Board of Highway Directors" (PDF). Idaho State Board of Highway Directors. September 12, 1972. p. 212. Retrieved February 21, 2017.
  3. ^ a b Google (February 17, 2017). "State Highway 81" (Map). Google Maps. Google. Retrieved February 17, 2017.
  4. ^ Bureau of Public Roads & American Association of State Highway Officials (November 11, 1926). United States System of Highways Adopted for Uniform Marking by the American Association of State Highway Officials (Map). 1:7,000,000. Washington, DC: United States Geological Survey. OCLC 32889555. Retrieved November 7, 2013 – via Wikimedia Commons.
  5. ^ U.S. Route Numbering Subcommittee (November 7, 1970). "U.S. Route Numbering Subcommittee Agenda Showing Action Taken by the Executive Committee" (PDF) (Report). Washington, DC: American Association of State Highway Officials. p. 6. Retrieved February 17, 2017 – via Wikimedia Commons.
  6. ^ U.S. Route Numbering Subcommittee (June 20, 1972). "U.S. Route Numbering Subcommittee Agenda Showing Action Taken by the Executive Committee" (Report). Washington, DC: American Association of State Highway Officials. p. 4. Retrieved February 17, 2017 – via Wikisource.
  7. ^ Idaho, 1972 Official Highway Map (Map). Cartography by Rand McNally. Idaho Transportation Department. 1972. § M5.
  8. ^ "Minutes of the Regular Meeting and East Idaho Tour of the Idaho Transportation Board, October 17–21, 1983" (PDF). Idaho Transportation Department. October 17, 1983. p. 239. Retrieved February 10, 2023.

External links

Media related to Idaho State Highway 81 at Wikimedia Commons