Interstate 15 Business (Great Falls, Montana)

Interstate 15 Business
Interstate 15 Business
	I-15 Bus. highlighted in red and unsigned I-315 highlighted in blue
Route information
	Business route of I-15
	Maintained by MDT
Length	5.834 mi[citation needed] (9.389 km)
Existed	1967–present
Major junctions
South end	I-15 / US 89 / MT 3 / MT 200 south of Great Falls
	US 89 / MT 3 / MT 200 in Great Falls
North end	I-15 / US 89 / MT 200 in Great Falls
Location
Country	United States
State	Montana
Counties	Cascade
Highway system
	Interstate Highway System; Main; Auxiliary; Suffixed; Business; Future; Montana Highway System; Interstate; US; State; Secondary;

Interstate 15 Business (I-15 Bus.) is a business loop of Interstate 15 (I-15) in Cascade County, Montana, United States, almost entirely within Great Falls. The route links I-15 (which bypasses downtown Great Falls to the west) with the center of Great Falls. As its business loop designation implies, I-15 Bus. terminates at I-15 (running concurrently with US Highway 89, or US 89, and Montana Highway 200, or MT 200, through western Great Falls) at each end. The southernmost 0.83 miles (1.34 km)^[1] of the route from the interchange with I-15 to Fox Farm Road is designated, but not signed, as Interstate 315 (I-315).^[2] I-315 is the second shortest Interstate in the country; only the unsigned I-878 in New York is shorter; it is also the northernmost auxiliary Interstate of I-15.

^ Starks, Edward (January 27, 2022). "Table 2: Auxiliary Routes of the Dwight D. Eisenhower National System of Interstate and Defense Highways". FHWA Route Log and Finder List. Federal Highway Administration. Retrieved April 9, 2023.
^ "Interstate 315 Montana". Interstate-Guide.com. Retrieved September 24, 2007.^{[self-published source]} (has pictures showing that I-315 is signed as BL 15)

[fhwa-1] Starks, Edward (January 27, 2022). "Table 2: Auxiliary Routes of the Dwight D. Eisenhower National System of Interstate and Defense Highways". FHWA Route Log and Finder List. Federal Highway Administration. Retrieved April 9, 2023.

[2] "Interstate 315 Montana". Interstate-Guide.com. Retrieved September 24, 2007.^{[self-published source]} (has pictures showing that I-315 is signed as BL 15)

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