Interstate 86 (Idaho)
Route information | ||||
---|---|---|---|---|
Maintained by ITD | ||||
Length | 62.85 mi[1][2] (101.15 km) | |||
Existed | 1978–present | |||
NHS | Entire route | |||
Major junctions | ||||
West end | I-84 / US 30 near Declo | |||
East end | I-15 in Chubbuck | |||
Location | ||||
Country | United States | |||
State | Idaho | |||
Counties | Cassia, Power, Bannock | |||
Highway system | ||||
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Interstate 86 (I-86) is an east–west intrastate
I-86 runs through a sparsely populated region along the south side of the Snake River and is mostly
The highway follows a section of the historic
Route description
I-86 begins at an interchange with
The freeway continues northeast between the Snake River and the
I-86 passes through the northern section of the Fort Hall Reservation, serving exits to
At 63 miles (101 km) in length, I-86 is one of the shortest primary Interstate Highways in the contiguous US.[8] The highway is maintained by the Idaho Transportation Department (ITD), which conducts an annual survey of traffic on certain highway segments that is expressed in terms of annual average daily traffic (AADT), a measure of traffic volume for any average day of the year. The busiest section of I-86 is near its eastern terminus in Chubbuck, carrying an average of 27,158 vehicles. The least-traveled section, near Massacre Rocks, sees only 6,759 vehicles on an average day.[9]
History
The route of I-86 largely follows the westernmost section of
In the original plans for the national expressway and freeway system, which would later become the Interstate Highway System, Pocatello was served by two major highways along US-30N and
US-30N was superseded by US-30 in 1972.[26] In 1973, the American Association of State Highway and Transportation Officials (AASHTO) adopted a new preference for duplicate numbers in lieu of suffixed designations.[27] As a result, I-15W was redesignated as I-86 in 1978; it was originally submitted as part of I-84 (the successor to I-80N).[28][29] By 1980, most of the freeway was completed, except for a 21-mile (34 km) section between Raft River and American Falls that was graded and scheduled to be temporarily paved.[30][31] The final four-lane section was constructed at a cost of $33 million (equivalent to $121 million in 2023[32]) beginning in 1978 and was dedicated on October 11, 1985.[33] The highway's construction was delayed by careful rock blasting next to utility lines, historic sites, and native wildlife habitats.[15]
The interchange with US-91 in Chubbuck was later rebuilt in 2013 as the state's first
Exit list
County | Location | mi[2] | km | Exit | Destinations | Notes |
---|---|---|---|---|---|---|
Cassia | | 0.000 | 0.000 | 1 | I-84 / US 30 west – Twin Falls, Ogden, Salt Lake | Western terminus; west end of US-30 overlap |
| 14.807 | 23.830 | 15 | Raft River Area | ||
Power | | 20.590 | 33.136 | 21 | Coldwater Area | |
| 28.100 | 45.223 | 28 | Massacre Rocks State Park | ||
| 32.620 | 52.497 | 33 | Neeley Area | ||
I-86 BL east – Rockland, American Falls | ||||||
40.110 | 64.551 | 40 | I-86 BL west – Aberdeen, American Falls | |||
| 44.327 | 71.337 | 44 | Seagull Bay | ||
| 49.152 | 79.102 | 49 | Rainbow Road | ||
| 52.491 | 84.476 | 52 | Arbon Valley | ||
| 55.551 | 89.401 | 56 | Pocatello Regional Airport | ||
| 58.087 | 93.482 | 58 | West Pocatello | East end of US-30 overlap | |
62.850 | 101.147 | 63 | I-15 – Idaho Falls, Salt Lake | Eastern terminus; signed as exits 63A (south) & 63B (north) | ||
1.000 mi = 1.609 km; 1.000 km = 0.621 mi
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Business route
Location | American Falls |
---|---|
Length | 4.605 mi[2] (7.411 km) |
Existed | 1972–present |
Interstate 86 Business (I-86 Bus) is a business route of I-86 that runs between two interchanges in American Falls. It travels northeast from the SH-37 interchange into downtown American Falls on Lincoln Street and Fort Hall Avenue, following the former route of US-30N. The route turns west onto Idaho Street for two blocks and crosses over a railroad before beginning its concurrency with SH-39 around the northwestern side of the city. The highways turn northeast onto Pocatello Avenue, which leads to an interchange with I-86 on the south side of American Falls Airport.[41]
The business route was originally created in 1972 as I-15W Bus, replacing a section of SH-37 within American Falls.[42]
Major intersections
The entire route is in American Falls, Power County.
mi[2] | km | Destinations | Notes | ||
---|---|---|---|---|---|
0.000 | 0.000 | I-86 west / US 30 west / SH-37 south – Twin Falls, Rockland | Western terminus | ||
2.942 | 4.735 | SH-39 north – Aberdeen, Blackfoot | West end of SH-39 overlap | ||
4.605 | 7.411 | I-86 east / US 30 east – Pocatello, Idaho Falls | Eastern terminus; east end of SH-39 overlap | ||
1.000 mi = 1.609 km; 1.000 km = 0.621 mi
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References
- ^ Starks, Edward (January 27, 2022). "Table 1: Main Routes of the Dwight D. Eisenhower National System of Interstate and Defense Highways". FHWA Route Log and Finder List. Federal Highway Administration. Retrieved September 3, 2022.
- ^ a b c d e "Interstate 86 Milepoint Log" (PDF). Idaho Transportation Department. January 25, 2016. Retrieved July 15, 2018.
- ^ OCLC 926912754.
- ^ a b c Google (July 14, 2018). "Interstate 86" (Map). Google Maps. Google. Retrieved July 14, 2018.
- ^ Johnson, David (May 6, 1990). "Idaho potatoes really are 'famous' in Power County". Lewiston Morning Tribune. Retrieved July 14, 2018.
- ^ Evensen, Kendra (August 3, 2011). "Wind farm project advances". Idaho State Journal. Pocatello, Idaho.
- ^ a b Bryce, Debbie (April 11, 2013). "Diamond In Rough: Most unique overpass in state making drivers, businesses irate". Idaho State Journal. Pocatello, Idaho. Retrieved July 14, 2018.
- ^ "Part VII - Miscellaneous Interstate Facts". Federal Highway Administration. Retrieved July 15, 2018.
- ^ "ATR & WIM Data: Interstate 86". Idaho Transportation Department. Retrieved July 15, 2018.
- .
- Newspapers.com.
- OCLC 992978006. Retrieved July 16, 2018 – via David Rumsey Historical Map Collection.
- OCLC 921180471. Retrieved July 15, 2018 – via David Rumsey Historical Map Collection.
- .
- ^ a b "ITD Vault: Last gap in I-86 dedicated with ceremonies". The Transporter. Idaho Transportation Department. December 4, 2015. Retrieved July 15, 2018.
- OCLC 4165975. Retrieved July 16, 2018 – via Wikimedia Commons.
- ^ Klare, Gene (June 5, 1956). "Federal Road Plan Means East Idaho Super Highways". Idaho State Journal. Pocatello, Idaho. p. 5. Retrieved July 16, 2018 – via Newspapers.com.
- ^ Official Route Numbering for the National System of Interstate and Defense Highways (JPG) (Map). American Association of State Highway and Transportation Officials. August 14, 1957. Retrieved May 4, 2014.
- ^ National System of Interstate and Defense Highways, As of June, 1958 (Map). American Automobile Association. June 1958. Retrieved July 16, 2018 – via Library of Congress.
- ^ "Work Starts Soon on Four-Lane Interstate Highway Near A.F." Idaho State Journal. Pocatello, Idaho. April 21, 1958. p. 1. Retrieved July 15, 2018 – via Newspapers.com.
- ^ "Interstate Highway Opened Near A.F." Idaho State Journal. Pocatello, Idaho. February 29, 1960. p. B13. Retrieved July 15, 2018 – via Newspapers.com.
- OCLC 34000159.
- ^ "New Interstate to Provide Safer Driving for Motorist". Idaho State Journal. Pocatello, Idaho. July 3, 1968. p. B6. Retrieved July 15, 2018 – via Newspapers.com.
- ^ "Interstate 'Highway to Sky' Open West of City". Idaho State Journal. Pocatello, Idaho. October 20, 1968. p. A3. Retrieved July 16, 2018 – via Newspapers.com.
- ^ "Key Links on I-15 Expected Open Soon". Idaho State Journal. Pocatello, Idaho. August 27, 1972. p. A3. Retrieved July 16, 2018 – via Newspapers.com.
- ^ 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. 5. Retrieved July 16, 2018 – via Wikisource.
- ^ "Establishment of a Marking System of the Routes Comprising the National System of Interstate and Defense Highways" (PDF). American Association of State Highway and Transportation Officials. January 2000. Archived from the original (PDF) on November 1, 2006. Retrieved July 16, 2018.
- ^ Special Committee on U.S. Route Numbering (July 6, 1977). "Route Numbering Committee Agenda" (PDF) (Report). Washington, DC: American Association of State Highway and Transportation Officials. p. 1. Retrieved July 16, 2018 – via Wikimedia Commons.
- ^ "Interstate across Idaho will be I-84". Times-News. Twin Falls, Idaho. Associated Press. September 6, 1979. p. C3. Retrieved July 11, 2018 – via Newspapers.com.
- OCLC 80747167. Retrieved July 15, 2018 – via The Internet Archive.
- ^ "Local highways improved". Times-News. Twin Falls, Idaho. October 4, 1979. p. B2. Retrieved July 15, 2018 – via Newspapers.com.
- Gross Domestic Product deflatorfigures follow the MeasuringWorth series.
- ^ "Final portion of I-84 done". Times-News. Twin Falls, Idaho. October 5, 1985. p. A3. Retrieved July 15, 2018 – via Newspapers.com.
- ^ Bryce, Debbie (October 7, 2015). "Officials credit diamond design for fewer crashes at I-86 interchange". Idaho State Journal. Pocatello, Idaho. p. 1. Retrieved February 12, 2023 – via NewsBank.
- ^ "Substantial Headway Made on Salt Lake Interchange Project East of Burley". Pacific Builder and Engineer. March 9, 2020. Retrieved March 22, 2020.
- ^ "I-84, I-86 Salt Lake System Interchange Project Status Update – January 2017" (PDF). Idaho Transportation Department. January 2017. Retrieved March 22, 2020.
- ^ Welch, Laurie (October 19, 2020). "Drivers warned not to avoid detour at Interstate 84-86 work project". Times-News. Twin Falls, Idaho. Retrieved September 13, 2021.
- ^ Harris, Shelbie (August 1, 2022). "'Historic investment': Gov. Little, state officials highlight aging bridges during 'Flying Y' groundbreaking". Idaho State Journal. Pocatello, Idaho. Retrieved February 12, 2023.
- ^ "$111.9 million Contract Awarded for Pocatello System Interchange" (Press release). Idaho Transportation Department. May 24, 2022. Retrieved February 12, 2023.
- ^ O'Connell, John (December 18, 2021). "ITD prepares to bid $100 million overhaul of 'Flying Y' interchange". Idaho State Journal. Pocatello, Idaho. Retrieved February 12, 2023.
- ^ Google (July 15, 2018). "Interstate 86 Business (American Falls)" (Map). Google Maps. Google. Retrieved July 15, 2018.
- ^ "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 July 15, 2018.
External links
- Media related to Interstate 86 (Idaho) at Wikimedia Commons