Interstate 180 (Wyoming)

Interstate 180 (I-180) is a one-mile (2 km)-long connector in the U.S. state of Wyoming between Interstate 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 Bus. / US 85 / US 87 Bus. in Cheyenne
North end
I-80 Bus. / US 30 / I-25 Bus. / US 85 / US 87 Bus. in Cheyenne[2]
Location
CountiesLaramie
Highway system

State highways in Wyoming

← 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 by being funded by Interstate dollars but not conforming to interstate highway standards.[3] The only grade separations are a diamond interchange at its southern end (at 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.[4]

I-180 is cosigned with the I-25 Business Loop, U.S. Highway 85, and U.S. Highway 87 Business, making it the only concurrency of an Interstate, an Interstate Business Loop, a U.S. route, and a Business U.S. route.[4] It is also the only 3-digit Interstate highway in Wyoming.

Route description

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 the 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 passes local homes and businesses. The road curves northwest 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 Bus./US 85/US 87 Bus. continue north on the one-way pair of Warren Avenue northbound and Central Avenue southbound.[5]

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 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.

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

Major intersections

The entire route is in Cheyenne, Laramie County.

mi[6]kmDestinationsNotes
0.000.00 US 85 south (I-25 Bus. / US 87 Bus. south) – GreeleyContinuation beyond I-80; south end of I-25 Bus./US 85/US 87 Bus. concurrencies
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 Bus. / US 30 (Lincolnway)Signalized at-grade intersections; Northern terminus
I-25 Bus. / US 85 / US 87 Bus. north (Warren Avenue)One-way street; outbound access only; continuation beyond US 30; north end of I-25 Bus./US 85/US 87 Bus. concurrencies
I-25 Bus. / US 85 / US 87 Bus. (Central Avenue)One-way street; inbound access only; north end of I-25 Bus./US 85/US 87 Bus. concurrencies
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

References
  1. FHWA Route Log and Finder List Table 2 - Auxiliary Routes
  2. It isn't clear whether Lincolnway, the road at the northern terminus of I-180, is US 30 or BUS US 30. There are Business US 30 shields where W Lincolnway splits off from I-80 (Photos: , from ) and on E Lincolnway (Photos: , from ) but there are East US 30/West US 30 shields at other places, including the I-180 junction.
  3. FHWA Route Log and Finder List Table 1 - Main Routes
  4. Photos showing road signs and traffic lights on I-180: Archived July 25, 2006, at the Wayback Machine from , and from .
  5. Google (December 19, 2013). "overview of Interstate 180" (Map). Google Maps. Google. Retrieved December 19, 2013.
  6. "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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