MileCheckWyoming is where interstate driving gets serious. I-80 across the south of the state has a fair claim to being America's most-closed interstate, and every closure, wind restriction, and reopening is announced by mile range. Here's how Wyoming's mileposts work, and where they matter most.
How Wyoming numbers its highways
Wyoming's mileposts count up from the west and south edges of the state. On I-80 the numbers start at 0 at the Utah line and climb east through Rock Springs, Rawlins, and Laramie to about 402 at the Nebraska line. I-25 counts up from the Colorado line through Cheyenne and Casper; I-90 counts up from the Montana line through Sheridan and Gillette. Mile marker data for every Wyoming highway is bundled into MileCheck and works offline — useful in a state with plenty of no-signal country.
The corridors people actually drive
- I-80 crosses about 400 miles of southern Wyoming, from Evanston through Rock Springs, Rawlins, and Laramie to Cheyenne.
- I-25 runs north from Cheyenne through Casper toward Buffalo.
- I-90 cuts the northeast corner through Sheridan and Gillette.
- US-287 and US-26 carry travelers toward the Wind River country, Jackson, and the Yellowstone gates.
Where mile markers matter most: Elk Mountain
The stretch of I-80 between Laramie and Rawlins — the Elk Mountain section, around milepost 255 — is the one truckers talk about. Sustained high wind blows over high-profile vehicles; blowing snow erases the road. When WYDOT restricts the road to certain vehicles or shuts it entirely, the announcement comes as a mile range, and the traffic backs up at Laramie and Rawlins until it reopens. If you drive I-80 in winter, you learn the mileposts whether you meant to or not.
Wind closures and winter shutdowns
Wyoming closures come in flavors: wind restrictions for light trailers and high-profile vehicles, full closures when a ground blizzard takes visibility, and rolling closures behind crashes. All of them are described by mile range. When the road shuts, so do the towns' motel vacancies — another reason to know what's ahead before you leave Laramie or Rawlins.
Wyoming alerts: what's in the app today
Straight talk: mile markers for every Wyoming highway are fully covered in MileCheck, offline included. Live WYDOT alerts aren't in the app yet — Wyoming doesn't currently publish an open public feed we can pull from, and we'll add them the day one becomes available. In the meantime, WYDOT's own 511 service (wyoroad.info) is the source for closures and wind restrictions, and MileCheck tells you exactly which milepost you're at when you check it.
Everyday and emergency
Whether you're waiting out a wind closure at Rawlins, reporting a slide-off near Elk Mountain, or telling a friend where to meet you on I-25, the mile marker is the location Wyoming's roads run on. MileCheck shows yours in real time, down to a tenth of a mile, even where the cell signal drops — with CarPlay and Android Auto for the long crossings.
Keep reading
Nearby state guides: Colorado · Idaho · Montana · Nebraska · South Dakota · Utah
Essentials: What to tell 911 on the highway · How to find your mile marker · Browse the live mile marker map · All 50 states