Section of Interstate Highway in Montana, United States
This article is about the section of Interstate 90 in Montana. For the entire route, see Interstate 90.
Interstate 90
I-90 highlighted in red
Route information
Maintained by MDT
Length
552.46 mi[1] (889.10 km)
Existed
1957–present
History
Completed in 1987
NHS
Entire route
Major junctions
West end
I-90 at Idaho state line
Major intersections
US 93 / MT 200 in Missoula
US 12 from Missoula to Garrison
I-15 west of Butte
I-115 in Butte
I-15 east of Butte
US 191 in Bozeman
US 212 / US 310 in Laurel
US 87 in Billings
I-94 in Billings
US 212 near Crow Agency
East end
I-90 / US 87 at Wyoming state line
Location
Country
United States
State
Montana
Counties
Mineral, Missoula, Granite, Powell, Deer Lodge, Silver Bow, Jefferson, Broadwater, Gallatin, Park, Sweet Grass, Stillwater, Yellowstone, Big Horn
Highway system
Interstate Highway System
Main
Auxiliary
Suffixed
Business
Future
Montana Highway System
Interstate
US
State
Secondary
← US 89
→ US 93
Interstate 90 (I-90) is an east–west transcontinental Interstate Highway across the northern United States, linking Seattle to Boston. The portion in the state of Montana is 552.54 miles (889.23 km) in length, passing through 14 counties in central and southern Montana. It is the longest segment of I-90 within a single state.[2]
^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 16, 2022.
^Rand McNally (2023). "United States" (Map). Rand McNally Road Atlas: United States (2024 ed.). 1:9,820,800. Chicago: Rand McNally. pp. 2–3. ISBN 978-0-528-02718-5.
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Global Information
I-90 at Idaho state line
I-90 / US 87 at Wyoming state line
