U.S. Route 87 in Wyoming

This article is about the section of U.S. Route 87 in Wyoming. For the entire route, see U.S. Route 87.

U.S. Highway 87 marker
U.S. Highway 87
Map
US 87 highlighted in red
Route information
Maintained by WYDOT
Length364.147 mi[1] (586.038 km)
Existed1926–present
Major junctions
South end I-25 / US 87 at the Colorado state line near Cheyenne
Major intersections
North end I-90 / US 87 at the Montana state line near Ranchester
Location
CountryUnited States
StateWyoming
CountiesLaramie, Platte, Converse, Natrona, Johnson, Sheridan
Highway system
  • Wyoming State Highway System
← US 85→ WYO 87


← WYO 176→ WYO 185
← WYO 343→ WYO 345
← WYO 345→ WYO 350

U.S. Route 87 (US 87) is a part of the U.S. Highway System that travels Port Lavaca, Texas, north to Havre, Montana. In the state of Wyoming, it extends approximately 364 miles (586 km) from the Colorado state line south of Cheyenne to the Montana state line northwest of Ranchester.[1] The majority of US 87 is concurrent with Interstate 25 and Interstate 90.[2]

Route description

US 87 enters Wyoming from Colorado concurrent with Interstate 25, a concurrency that begins in Raton, New Mexico, and the enter Cheyenne and intersect Interstate 80. Between exits 12 and 17 is a 4.8-mile (7.7 km) concurrency with US 85, which departs at Ranchettes. I-25 and US 87 continue 75 miles (121 km) north to Dwyer Junction, where it intersects US 26 at exit 92 and it joins the concurrency. The three routes continue 34 miles (55 km) north to Orin, where at exit 126 it intersects US 18 and US 20; US 18 terminates at the location but US 20 joins the route. I-25, US 20, US 26, and US 87 travel northward for 34 miles (55 km) to exit 160 east of Glenrock, where US 20, US 26, and US 87 follow a 27-mile (43 km) segment separate from I-25. The routes rejoin I-25 in Casper at exit 186 for 2.7 miles (4.3 km), where US 20 and US 26 split westward at exit 189. US 87 remains concurrent with I-25 northward until its terminus with Interstate 90 near Buffalo,[1] concluding its 580-mile (930 km) concurrency over three states (unsigned in Colorado and New Mexico).

US 87 follows I-90 west for 12 miles (19 km) to exit 44, where it follows a 18-mile (29 km) section independent of another Interstate or U.S. highway, the only such section in Wyoming. A portion of US 87 was washed out in the late 1990s at the Massacre Hill Historic Site, so detour signs are posted directing US 87 traffic along WYO 193 through Story. US 87 is still officially designated through the disconnected washed out area; however the section is unsigned in favor of WYO 346 to the south and WYO 344 to the north of the washed out area.[1]

North of WYO 193, US 87 signage resumes and it continues to Sheridan and rejoins I-90 at exit 25. I-90 and US 87 share a 16-mile (26 km) concurrency US 14 to exit 9 at Ranchester, where US 14 splits west. I-90 and US 87 continue 10 miles (16 km) northward and crosses into Montana.[1]

History

U.S. Route 185

U.S. Route 185 marker
U.S. Route 185
LocationCheyenne–Casper
Length124 mi (200 km)
Existed1926–1934

U.S. Route 185 (US 185) was an intrastate U.S. Highway that was the main route between Cheyenne and Casper; it was replaced by U.S. Route 87 in 1936.[3]

Massacre Hill washout

Wyoming Highway 344 marker
Wyoming Highway 344
LocationSheridan County
Length1.95 mi[1] (3.14 km)
Wyoming Highway 346 marker
Wyoming Highway 346
LocationJohnson County, Sheridan County
Length2.67 mi[1] (4.30 km)

In the late 1990s, a short section of US 87 / WYO 344 at the Massacre Hill Historic Site, had been permanently closed due to recurring landslides.[4] According to the Wyoming Department of Transportation, the stretch of roadway has ongoing and costly maintenance problems, with the most recent landslides closing the roadway as of the Spring of 1998.[4] Because repairing the roadway could potentially damage the historic site, WYDOT recommends that through traffic use either Interstate 90 or Wyoming 193 as an alternate route.[4]

As a result of the landslide on US 87, Wyoming petitioned the American Association of State Highway and Transportation Officials (or AASHTO) to reroute US 87 over Highway 193 in the late 1990s. However, this was denied. Consequently, a detour for US 87 follows WYO 193 since it is unlikely that US 87 will be reconstructed at its current location.[5]

Major intersections

CountyLocationmi[1]kmDestinationsNotes
Laramie​0.0000.000
 I-25 south (US 87 south) – Fort Collins		Continuation into Colorado; continuation of I-25 concurrency; US 87 is unsigned in Colorado
See I-25 (exits 2-160)
Converse​160.834258.837

 I-25 north / I-25 BL begins – Casper		I-25 exit 160; north end of I-25 concurrency; south end of I-25 BL concurrency; continuation of US 20 (from exit 126) / US 26 (from exit 92) concurrency
162.017260.741
 WYO 90 south (Boxelder Road)
Glenrock165.664266.610
 I-25 BL north / WYO 95 south (4th Street) to I-25		West end of I-25 BL concurrency
166.183267.446
 WYO 95 north – Rolling Hills
NatronaEvansville184.027296.163


 WYO 256 north (Cole Creek Road) / WYO 253 south (Hat Six Road) to I-25
186.840300.690

 WYO 258 south (Curtis Street) to I-25
Casper187.856–
188.189		302.325–
302.861






 I-25 BL north / US 20 Bus. west / US 26 Bus. west / US 87 Bus. north (Yellowstone Street) / North Beverly Street / Bryan Stock Trail

 I-25 south – Cheyenne		I-25 exit 186; south end of I-25 concurrency; north end US 20 / US 26 concurrency at I-25 exit 189
See I-25 (exits 186-300)
JohnsonBuffalo302.502486.830

 I-25 ends / I-90 east – Gillette, Rapid City		I-25 northern terminus; north end of I-25 concurrency; south end of I-90 concurrency; I-25 exit 300; I-90 exit 56B; exit numbers follow I-90
See I-90 (exits 56-44)
Johnson​314.661506.398
 I-90 west – Sheridan		I-90 exit 44; north end of I-90 concurrency
316.401509.198

 WYO 193 north (US 87 Detour) / WYO 346 begins – Story		South end of US 87 unsigned section (disconnected); detour via WYO 193; south end of WYO 346 concurrency
Sheridan​319.071513.495
 WYO 346 ends		North end of WYO 346 concurrency
Section closed due to landslides
321.300517.082
 WYO 344 begins		South end of WYO 344 concurrency
323.251520.222

 WYO 193 south (US 87 Detour) / WYO 344 ends – Story		North end of US 87 unsigned section; north end of WYO 344 concurrency
328.225528.227

 WYO 342 east (Made Creek Road) to I-90
333.041535.978

 WYO 332 north / WYO 335 south – Big Horn
Sheridan336.992542.336
 WYO 334 west (Brundage Lane)





 I-90 BL west / US 14 Bus. west / US 87 Bus. north (Coffeen Avenue)		South end of I-90 BL / US 14 Bus. concurrency
337.271542.785
 I-90 east – Buffalo




 I-90 BL ends / US 14 Bus. ends / US 14 east – Ucross		North end of I-90 BL / US 14 Bus. concurrency; south end of I-90 / US 14 concurrency; north end of US 14 concurrency at I-90 exit 9
See I-90 (exits 25-1)
Sheridan​364.147586.038

 I-90 west / US 87 north – Hardin, Billings		Continuation into Montana
1.000 mi = 1.609 km; 1.000 km = 0.621 mi
  •       Closed/former
  •       Concurrency terminus

Special routes

Main article: Special routes of U.S. Route 87

Former routes

See also

References

  1. ^ a b c d e f g h State Maintenance Engineer’s Office (October 1, 2017). "Maintenance Section Reference Book" (PDF). Wyoming Department of Transportation. Retrieved January 8, 2026.
  2. ^ Wyoming Transportation Commission (2011). Wyoming Official Highway Map (PDF) (Map). Cheyenne: Wyoming Department of Transportation.
  3. ^ "Former U.S. 185". AARoads. June 1, 2023. Retrieved February 10, 2026.
  4. ^ a b c "U.S. Highway 87". AARoads. September 22, 2005. Retrieved January 13, 2026.
  5. ^ "Highway 193". AARoads. July 7, 2025. Retrieved January 16, 2026.
KML file ( • help)
Template:Attached KML/U.S. Route 87 in Wyoming
KML is not from Wikidata
allikas: https://en.wikipedia.org/wiki/U.S._Route_87_in_Wyoming