Interstate 180 (Wyoming)

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Interstate 180 marker

Interstate 180
North Greeley Highway
Route information
Auxiliary route of I-80
Maintained by WYDOT
Length: 1.09 mi[1] (1.75 km)
Existed: 1984 – present
Major junctions
South end: I-80 in Cheyenne
North end: I-80 Bus. / US 30 in Cheyenne[2]
Highway system
WYO 175 US 185

Interstate 180 (I-180) is a one-mile (1.75 km)-long connector in the U.S. state of Wyoming off Interstate 80 into downtown Cheyenne, Wyoming.

I-180/US 85/I-25 BUS (south) at its northern terminus at US 30/I-80 BUS (Lincolnway) in Cheyenne.

It is unusual for being the only Interstate Highway that does not conform to Interstate Highway standards, and is not even a freeway, anywhere along its route.[1] The only grade separations are a diamond interchange at its southern end at I-80, as well as bridges over 1st Street and the Union Pacific railroad tracks. However, even the interchange with I-80 is a standard diamond with signalized intersections. It is a divided at-grade expressway with a 40 mph (64 km/h) speed limit due to the frequency of signals. There are five traffic signals along I-180.[3] This is nowhere near Interstate standards, but it received federal funding under the Interstate Highway program.

I-180 is cosigned with Business Loop Interstate 25, U.S. Highway 85 and U.S. Highway 87 Business, making it the only concurrency of an Interstate, a Business Loop Interstate, a U.S. route and a Business U.S. route.[3] It is also the only 3-digit interstate in Wyoming.

Route description[edit]

I-180 begins at a diamond interchange with I-80 in Cheyenne, heading north concurrent with I-25 Bus./US 85/US 87 Bus. on four-lane divided North Greeley Highway. South of this interchange, I-25 Bus./US 85/US 87 Bus. continue along North Greeley Highway. From the southern terminus, I-180 passes over Deming Drive and heads near homes and businesses. The road curves northwest and intersects 5th Street at a traffic light. The highway continues along and passes under a pedestrian bridge at 7th Street before crossing 9th Street at a signalized intersection. Past 9th Street, the directions of I-180 split and pass over a large Union Pacific Railroad yard. After this bridge, I-180 reaches its northern terminus at an at-grade signalized intersection with I-80 Bus./US 30. Past this intersection, I-25 Bus./US 85/US 87 Bus. continue north on the one-way pair of Warren Avenue northbound and Central Avenue southbound.[4]

Major intersections[edit]

The entire route is in Cheyenne, Laramie County.

mi[5] km Destinations Notes
0.00 0.00
I-25 Bus. south / US 85 south / US 87 Bus. south – Greeley, CO, Denver, CO
Continuation past I-80
I-80 – Sidney, Rock Springs, Omaha, Salt Lake Southern terminus; exit 362 on I-80
0.34 0.55 5th Street At-grade intersection; signalized intersection
0.61 0.98 9th Street At-grade intersection; signalized intersection
1.09 1.75 I-80 Bus. / US 30 (Lincolnway) At-grade intersections; signalized intersections; northern terminus

I-25 Bus. north / US 85 north / US 87 Bus. north
Continuation past US 30
1.000 mi = 1.609 km; 1.000 km = 0.621 mi


  1. ^ a b FHWA Route Log and Finder List - Interstate System - Design - FHWA
  2. ^ It isn't clear whether Lincolnway, the road at the northern terminus of I-180 is US 30 or BUS US 30. [1] There are Business US 30 shields where W Lincolnway splits off from I-80 (Photos: [2], [3] from [4]) and on E Lincolnway (Photos: [5], [6] from [7]) but there are East US 30/West US 30 shields at other places, including the I-180 junction. [8]
  3. ^ a b Photos showing road signs and traffic lights on I-180: [9] from [10], [11] and [12] from [13].
  4. ^ Google (December 19, 2013). "overview of Interstate 180" (Map). Google Maps. Google. Retrieved December 19, 2013. 
  5. ^ "Reference Marker Book". Wyoming Department of Transportation. November 2004. Archived from the original (PDF) on 2007-03-11. Retrieved 2007-03-10. 

External links[edit]

Route map: Google

KML is from Wikidata