Wyoming Highway 345

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Wyoming Highway 345 marker

Wyoming Highway 345
Route information
Maintained by WYDOT
Length: 19.27 mi[2] (31.01 km)
Existed: 1985[1] – present
Major junctions
West end: S-451 at Montana State Line
East end: I-90 / US 14 / US 87 in Acme
Counties: Sheridan
Highway system

State highways in Wyoming

WYO 344 WYO 350
US 85 US 87.svg US 89

Wyoming Highway 345 is a 19.27-mile (31.0 km) Wyoming State Road located in northern Sheridan County.

Route description[edit]

Wyoming Highway 345 begins its western end (or northern end at this point) at Montana Secondary Highway 451 at the Montana State Line, approximately 3 miles north of Parkman, Wyoming.[3] For its entire length, WYO 345 parallels the Burlington Northern Santa Fe Railway and to some extent Interstate 90/US Route 87, which lies north of it. Highway 345 travels through the census-designated place (CDP) of Parkman at about 3 miles, as it turns gently southeast. Shortly after, the northern terminus of Wyoming Highway 343, which links to US 14 at Dayton, is met at just under 6 miles. Highway 345 continues eastward toward Ranchester which it reaches nearing 12 miles and US 14 which provides access to exit 9 of Interstate 90.[3][1] Past Ranchester WYO 345 now closely parallels the interstate in its last stretch. Highway 345 meets Interstate 90/US Route 87/US Route 14 at Milepost 19.27, at the "Acme Interchange," its eastern terminus. The roadway continues east as Acme Road past the interchange to Acme.


The entire length of Wyoming Highway 345 was originally designated as US Route 87.[1] This section of US 87 was the last to be decommissioned in favor of the I-90 routing. In March 1985, when I-90 was completed, the Interstate Highway System in Wyoming was completed. At the same time, US 87 was rerouted to Interstate 90 and as a result the former routing through Ranchester became WYO 345.[1]

Major intersections[edit]

The entire route is in Sheridan County.

Location mi km Destinations Notes
Montana State Line 0.00 0.00 S-451 Western terminus of WYO 345
Continuation into Montana
southeast of Parkman 5.81 9.35 WYO 343 Northern terminus of WYO 343
Ranchester 12.80 20.60 US 14 to I-90 / US 87 To exit 9 (I-90/US 87)
Acme 19.27 31.01 I-90 / US 14 / US 87 Eastern terminus of WYO 345
Exit 14 (I-90/US 14/US 87)
1.000 mi = 1.609 km; 1.000 km = 0.621 mi


External links[edit]