Interstate 180 (Wyoming)

Interstate 180 (I-180) is a one-mile-long (2 km) connector in the U.S. state of Wyoming between I-80 and downtown Cheyenne, Wyoming.

Interstate 180
I-180 highlighted in red
Route information
Auxiliary route of I-80
Maintained by WYDOT
Length1.09 mi[1] (1.75 km)
Existed1984–present
Major junctions
South end
 I-80 / I-25 BL / US 85 / US 87 Bus. in Cheyenne
North end
 I-80 BL / US 30 / I-25 BL / US 85 / US 87 Bus. in Cheyenne
Location
CountryUnited States
StateWyoming
CountiesLaramie
Highway system
  • Wyoming State Highway System
← WYO 175→ US 185

It is unusual for being one of the few Interstate Highways that does not conform to Interstate Highway standards. There is also no freeway anywhere along its route.[1] Other routes in Alaska and Hawaii are similar in nature, as they are funded by Interstate dollars, but do not conform to interstate highway standards.[2] The only grade separations are a diamond interchange at its southern end (at a junction with I-80) and a pair of bridges that run 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.

I-180 is cosigned with the I-25 Business Loop (I-25 BL), U.S. Highway 85 (US 85), and U.S. Highway 87 Business (US 87 Bus.), making it the only concurrency of an Interstate, an Interstate Business Loop, a U.S. Highway, and a Business U.S. Highway. It is also the only three-digit Interstate Highway in Wyoming.

Route description
I-180/US 85/I-25 BL (south) at its northern terminus at US 30/I-80 BL (Lincolnway) in Cheyenne

I-180 begins at a diamond interchange with I-80 in Cheyenne, heading north concurrently with I-25 BL/US 85/US 87 Bus. on the four-lane divided North Greeley Highway. South of this interchange, I-25 BL/US 85/US 87 Bus. continue along North Greeley Highway. From the southern terminus, I-180 passes over Deming Drive and passes local homes and businesses. The road curves northwesterly and intersects 5th Street at a traffic light. The highway 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 BL/US 85/US 87 Bus. continue north on the one-way pair of Warren Avenue northbound and Central Avenue southbound.[3]

History

I-180 was conceived in November 1967, when Wyoming requested it for a new spur route into Cheyenne. The American Association of State Highway Officials (AASHO) added it to the Interstate Highway System in June 1970. The original plan was to have a freeway along the same corridor, with a full freeway-to-freeway interchange at I-80, but the Federal Highway Administration (FHWA) rejected it in December 1970 due to high cost and access issues. Wyoming revised the proposal to the current configuration in February 1971, and it was approved by the FHWA that March. I-180 opened in June 1984, after six years of expressway upgrades.

Major intersections

The entire route is in Cheyenne, Laramie County.

mi[4]kmDestinationsNotes
0.000.00 US 85 south (I-25 BL / US 87 Bus. south) – GreeleyContinuation beyond I-80; southern end of I-25 BL/US 85/US 87 Bus. concurrency
I-80 – Rock Springs, SidneySignalized interchange; southern terminus; I-80 exit 362
0.340.555th StreetSignalized at-grade intersection
0.610.989th StreetSignalized at-grade intersection
1.091.75 I-80 BL / US 30 (Lincolnway)Signalized at-grade intersections; northern terminus
I-25 BL / US 85 / US 87 Bus. north (Warren Avenue)One-way street; outbound access only; continuation beyond US 30; northern end of I-25 BL/US 85/US 87 Bus. concurrency
I-25 BL / US 85 / US 87 Bus. (Central Avenue)One-way street; inbound access only; northern end of I-25 BL./US 85/US 87 Bus. concurrency
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

References
  1. Starks, Edward (January 27, 2022). "Table 2: Auxiliary Routes of the Dwight D. Eisenhower National System of Interstate and Defense Highways as of December 31, 2021". FHWA Route Log and Finder List. Federal Highway Administration. Retrieved March 24, 2022.
  2. Starks, Edward (January 27, 2022). "Table 1: Main Routes of the Dwight D. Eisenhower National System of Interstate and Defense Highways as of December 31, 2021". FHWA Route Log and Finder List. Federal Highway Administration. Retrieved March 24, 2022.
  3. Google (December 19, 2013). "Overview Map of Interstate 180" (Map). Google Maps. Google. Retrieved December 19, 2013.
  4. Reference Marker Book. Wyoming Department of Transportation. November 2004. Archived from the original (PDF) on March 11, 2007. Retrieved March 10, 2007.

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