Wyoming Road Map

Interstate and U.S. State Highways of Wyoming

Wyoming’s highway network is the backbone of travel, freight movement, and tourism in the state. Although Wyoming has a small population, it sits at the crossroads of major east–west and north–south corridors linking the Pacific Northwest and northern Rockies to the Midwest and the Mountain Southwest. Understanding the interstate, U.S., and state highway systems in Wyoming helps explain how communities stay connected, how energy and agricultural products move to market, and how visitors access iconic destinations like Yellowstone and Grand Teton National Parks.

How Wyoming’s Highway System Is Organized

Wyoming’s roads fall into several overlapping systems:

• Interstate Highways – Federally designated, high‑speed, limited‑access routes that handle long‑distance travel and heavy freight.
• U.S. Highways – Older national routes that predate the interstates; many still serve as important regional connectors and alternatives to the interstate system.
• Wyoming State Highways (WYO or WY) – Numbered and maintained by the state; they link smaller towns, rural areas, recreational sites, and state border crossings.
• Local roads – County and municipal roads that connect to the state and federal networks.

The Wyoming Department of Transportation (WYDOT) manages planning, construction, maintenance, and operation of the state and federal routes within Wyoming, including snow and ice control, pavement preservation, and safety improvements such as wildlife crossings and passing lanes.

Interstate Highways in Wyoming

Wyoming is served by three primary Interstate Highways, with one significant business loop system and several auxiliary connections. These interstates are essential corridors for coast‑to‑coast trucking, regional commerce, and long‑distance travelers.

Interstate 25 (I‑25)

Interstate 25 is Wyoming’s primary north–south interstate, entering from Colorado near Cheyenne and continuing to Montana near Sheridan.

• Length in Wyoming: Approximately 300 miles.
• Southern terminus in WY: Colorado state line south of Cheyenne.
• Northern terminus in WY: Montana state line north of Sheridan, where it transitions into I‑90.
• Major cities served: Cheyenne, Wheatland, Douglas, Casper, Buffalo, Sheridan.

Functionally, I‑25:

• Links the Front Range corridor (Denver–Fort Collins–Cheyenne) with central and northern Wyoming.
• Connects Casper, the state’s second‑largest city, to the wider interstate network.
• Intersects with I‑80 at Cheyenne, creating a major hub for north–south and east–west trucking flows.
• Closely parallels older U.S. Highway corridors such as US 87.

Interstate 80 (I‑80)

Interstate 80 is Wyoming’s most heavily used interstate and one of the nation’s primary east–west freight corridors, connecting California and the West Coast with the Midwest and East.

• Length in Wyoming: Roughly 400 miles, spanning the state from the Utah border to the Nebraska border.
• Western terminus in WY: Utah state line near Evanston.
• Eastern terminus in WY: Nebraska state line east of Pine Bluffs.
• Major cities and towns served: Evanston, Rock Springs, Green River, Rawlins, Laramie, Cheyenne.

Key characteristics of I‑80 in Wyoming include:

• Freight dominance: A high percentage of traffic consists of long‑haul trucks moving goods between the West Coast and the Midwest.
• Challenging weather: High elevations and open plains, particularly between Rawlins and Laramie, lead to frequent high‑wind and winter‑storm closures. WYDOT operates advanced road‑weather information systems and variable message signs along this corridor.
• Critical economic role: Shippers, energy producers, and agricultural operations rely on I‑80 for efficient access to out‑of‑state markets.
• Parallel routes: Historic U.S. 30 and parts of the old Lincoln Highway corridor run near or along I‑80 through Wyoming.

Interstate 90 (I‑90)

Interstate 90 provides Wyoming’s northern east–west interstate connection, linking the Pacific Northwest and northern Rockies with the northern Plains and upper Midwest.

• Length in Wyoming: Around 210 miles.
• Western terminus in WY: Montana state line northwest of Sheridan.
• Eastern terminus in WY: South Dakota state line near Sundance.
• Major cities and towns served: Sheridan, Buffalo, Gillette, Moorcroft, Sundance.

I‑90 in Wyoming:

• Intersects I‑25 at Buffalo, forming a key interchange between northern and central corridors.
• Serves the Powder River Basin, one of the most productive coal regions in the United States, supporting energy and mining logistics.
• Provides access to Devils Tower National Monument via connecting state and U.S. highways near Sundance and Moorcroft.

Interstate Business Loops and Spurs

Wyoming maintains multiple business loops and spurs off the main interstates, typically signed as Business I‑25, Business I‑80, or Business I‑90. These segments:

• Follow older alignments of U.S. or state highways through downtown areas.
• Connect city centers and main streets to the bypassing interstates.
• Are important for local commerce, visitor services, and wayfinding.

Examples include business routes through Cheyenne, Laramie, Casper, Rock Springs, and Sheridan, where travelers can exit the mainline interstate to access city cores, fuel, food, and lodging.

U.S. Highways in Wyoming

The U.S. Highway system predates the Interstate era and once carried most long‑distance traffic across the state. Today, these routes remain vital as regional connectors, scenic byways, and redundancy for the interstate network, particularly in rural and mountainous areas.

Major East–West U.S. Highways

U.S. Highway 14 / 14A

US 14 is one of Wyoming’s key east–west U.S. routes, running from the Yellowstone National Park entrance near Cody eastward to the South Dakota border near Devils Tower and Sundance.

• Traverses the Bighorn Basin and climbs the Bighorn Mountains.
• Runs concurrently with or connects to I‑90 in northern Wyoming.
• Serves communities like Cody, Greybull, Lovell, Sheridan, and Gillette (via nearby connections).

The US 14A (Alternate 14) segment is a high‑elevation, seasonal route over the Bighorn Mountains, renowned for:

• Steep grades and tight curves, attracting experienced drivers and motorcyclists.
• Spectacular mountain scenery, including access to the Bighorn National Forest.
• Seasonal closures during winter due to heavy snow and hazardous conditions.

U.S. Highway 16

US 16 is often promoted as part of the “Route to Yellowstone” marketing corridor. In Wyoming it runs generally east–west between:

• Eastern terminus: South Dakota border near Newcastle.
• Western connections: Worland and the Bighorn Basin, ultimately linking toward Yellowstone via intersecting routes.

West of Buffalo, US 16 crosses the Bighorn Mountains as “Cloud Peak Skyway,” a designated scenic byway. It offers:

• Mountain passes with steep gradients and significant snowfall in winter.
• Access to outdoor recreation such as hiking, camping, and fishing.

U.S. Highway 20

US 20 crosses central Wyoming from the Yellowstone gateway near West Yellowstone (via US 191/89/287 connections) through:

• Eastern Yellowstone region (via shared segments with other U.S. routes).
• Thermopolis (noted for its hot springs), Worland, and Basin.
• Casper and Douglas area, often overlapping other U.S. designations like US 26.

Although US 20 is a transcontinental route nationally, in Wyoming it functions chiefly as a regional east–west connector through central basins and plains.

U.S. Highway 26

US 26 is a prominent corridor that effectively links Idaho and the Snake River Plain to central and eastern Wyoming.

• Western segment: From the Idaho border near Alpine Junction, following the Snake and then the Wind River region.
• Major communities: Alpine, Jackson area (via concurrent routes), Dubois, Riverton, Shoshoni, Casper, and eastern communities.
• Eastern segment: Extends toward Nebraska, often overlapping with I‑25 and other U.S. highways.

US 26, along with intersecting routes like US 189 and US 191, is a primary approach to Grand Teton and Yellowstone National Parks from the south and east.

U.S. Highway 30

US 30 largely parallels I‑80 across southern Wyoming and represents a part of the old Lincoln Highway, one of America’s earliest coast‑to‑coast auto routes.

• Enters from Idaho near Cokeville and generally runs east across the state to Nebraska.
• Shares alignment with I‑80 in many places but diverges to serve local communities the interstate bypasses.
• Provides redundancy when sections of I‑80 close due to severe weather.

Key North–South U.S. Highways

U.S. Highway 85

US 85 is a long north–south corridor through the central U.S. That section in Wyoming:

• Enters from Colorado south of Cheyenne.
• Runs north through communities like Cheyenne, Torrington, and Lusk.
• Exits into South Dakota near the Black Hills region.

US 85 is important for:

• Regional agricultural transport in eastern Wyoming.
• Providing an alternate north–south option to I‑25, especially for more easterly communities.

U.S. Highway 87

US 87 runs roughly parallel to I‑25 and I‑90 through Wyoming and is often concurrent with those interstates.

• Linking Cheyenne, Casper, Buffalo, and Sheridan.
• Serving as a legacy route from pre‑interstate days, supplementing the freeway system.

While much of US 87 shares roadway with interstates, signed segments and older alignments still provide important access to smaller communities and local road networks.

U.S. Highway 191

US 191 is a major north–south corridor from Arizona to Montana, with a critical segment in western Wyoming.

• Enters Wyoming from Utah near Flaming Gorge / Dutch John area.
• Runs north through Rock Springs and Pinedale.
• Continues toward Jackson and Yellowstone (partly concurrent with US 89 and US 26).

In Wyoming, US 191:

• Serves the energy‑producing Green River Basin and recreational areas around Flaming Gorge and the Wind River Range.
• Acts as a key tourist corridor to the national parks from Utah and southwestern states.

U.S. Highway 189

US 189 generally follows a southwest–to–north alignment through western Wyoming:

• Enters from Utah near Evanston.
• Runs through Kemmerer and Big Piney, before converging with US 191 near the Pinedale area.

US 189 supports:

• Energy and trona mining operations around southwest Wyoming.
• Access to hunting, fishing, and other outdoor recreation in the Wyoming Range and surrounding public lands.

Other Notable U.S. Highways

Additional U.S. routes weave across the state and fill in regional gaps:

• US 89 – Key north–south scenic route along the western edge of Wyoming, supporting travel between Utah, Jackson, Grand Teton National Park, and Yellowstone.
• US 191 / 189 / 89 corridors – Combined, they form one of the primary access systems to the national parks from the south and southwest.
• US 212 – A short segment in far north‑northwest Wyoming, known as part of the Beartooth Highway, a famously scenic and seasonally open alpine road connecting to Montana and the northeast entrance of Yellowstone.

Wyoming State Highway System

Beyond interstates and U.S. routes, the Wyoming State Highway (WYO or WY) system is extensive, connecting smaller communities, ranching areas, reservations, industrial sites, and recreational regions. These routes are typically numbered with two or three digits and marked with Wyoming’s distinctive bucking horse and rider silhouette on the highway shield.

Numbering and Signing Conventions

Wyoming’s state highway numbering practices include:

• Two‑digit numbers – Often denote more historically significant corridors or earlier additions to the system.
• Three‑digit numbers – Common for regional connectors, local access routes, and spurs off major highways.
• Spur and loop routes – Occasionally signed with unique numbers but functionally serve single communities or recreation areas.

While there is no rigid statewide grid like in some states, WYDOT tends to:

• Group numbering geographically to some extent (clusters within basins or districts).
• Avoid duplication with U.S. and interstate numbers within the same area where practical.

Examples of Important Wyoming State Highways

The full list of state routes is long; the following highlights some of the most consequential from a travel, economic, or recreational perspective.

WYO 22 – Teton Pass

Wyoming Highway 22 runs west from Jackson over Teton Pass to the Idaho state line, connecting with Idaho Route 33.

• Serves heavy commuter traffic between Jackson and Idaho communities like Victor and Driggs.
• Features steep grades and avalanche‑prone slopes; winter driving can be hazardous and subject to closures.
• Critical for workforce mobility in the Jackson Hole region, where many workers live across the border in Idaho.

WYO 59 – Douglas to Gillette Corridor

Wyoming Highway 59 is a major north–south state route connecting:

• Southern terminus: Douglas, intersecting I‑25 and US 20/26.
• Northern terminus: Near Gillette and Wright, linking to I‑90 and US 14/16/87.

WYO 59 is especially notable for:

• Serving the heart of the Powder River Basin coal and energy region.
• High volumes of heavy truck traffic tied to mining and oil/gas operations.
• Ongoing safety improvements, passing lanes, and traffic management initiatives due to its mix of industrial and general traffic.

WYO 120 – Cody to Montana

Wyoming Highway 120 connects Cody northward to the Montana border, where it becomes an important link toward Billings.

• Supports tourism flows to and from Yellowstone via Cody.
• Serves ranching communities and oil/gas fields in the Bighorn Basin.

WYO 130 – Snowy Range Scenic Byway

Wyoming Highway 130 extends west from Laramie into the Medicine Bow Mountains and over the Snowy Range Scenic Byway.

• Offers access to alpine lakes, hiking trails, and campgrounds.
• Reaches high elevations and is typically closed in winter across the high pass section.
• Designated as a scenic byway due to its dramatic mountain views and recreational access.

WYO 89 – Western Border Connector

Wyoming Highway 89 clips in and out along the Utah–Idaho–Wyoming border region, connecting small communities and recreational areas near Bear Lake and Star Valley.

• Intertwines with US 89 and other state routes along the western edge of the state.
• Serves ranching and tourism economies in scenic valleys and mountain foothills.

WYO 28 – South Pass and the Oregon Trail

Wyoming Highway 28 links US 287/789 near Lander with US 191 south of Pinedale, crossing South Pass, a historically vital mountain crossing on the Oregon Trail.

• Provides access to historical sites related to the Oregon, California, and Mormon Pioneer Trails.
• Connects sparsely populated but resource‑rich areas, supporting mining and ranching.
• Forms part of scenic and heritage tourism loops in central and western Wyoming.

Notable Spurs to Parks, Recreation, and Reservations

Numerous state highways serve as spurs to major destinations:

• Routes providing access to Yellowstone and Grand Teton National Parks from gateway towns like Cody, Jackson, and Dubois.
• Highways entering or traversing the Wind River Reservation, home to the Eastern Shoshone and Northern Arapaho tribes.
• Roads leading to state parks, reservoirs, and national forests such as Boysen Reservoir, Flaming Gorge, and Keyhole Reservoir.

Engineering and Operational Challenges in Wyoming

Managing interstate and state highways in a high‑altitude, sparsely populated state poses unique challenges for WYDOT and road users.

Weather, Elevation, and Seasonal Closures

Wyoming’s highways cross high plains and mountain passes, exposing them to:

• Blizzards, ice, and high winds – Frequent along I‑80 and exposed basins, leading to periodic closures for safety.
• Drifting snow and reduced visibility – Particularly problematic on east–west corridors.
• Seasonal mountain closures – Routes like US 14A, WYO 130 (Snowy Range), and parts of US 212 (Beartooth Highway) typically close for winter.

WYDOT relies on:

• Snowplows and specialized equipment for high‑elevation operations.
• Road‑weather information systems, cameras, and variable message signs.
• Chain‑up areas and wind‑closure gates for trucks on key corridors.

Rural Distances and Limited Services

Large sections of Wyoming’s highways traverse remote regions with long distances between services. For travelers, this means:

• Planning fuel stops carefully, especially on state and U.S. routes away from interstates.
• Carrying emergency supplies in winter (blankets, water, food, and a charged phone).
• Monitoring road conditions via WYDOT information channels before departing.

Wildlife and Safety Considerations

High populations of deer, elk, antelope, and other wildlife near roadways create collision risks, particularly at dawn, dusk, and during migration seasons.

• Several corridors, especially near Jackson and other wildlife‑rich zones, feature wildlife overpasses and underpasses with fencing that guide animals safely across roads.
• Speed limits and warning signs are strategically placed in known high‑collision areas.

Economic, Cultural, and Recreational Roles of Wyoming Highways

Wyoming’s interstate and state highways are more than just transportation links—they shape the state’s economy, culture, and access to the outdoors.

Freight, Energy, and Agriculture

Key sectors depend heavily on the highway network:

• Energy: Coal from the Powder River Basin, oil, natural gas, and trona (soda ash) move via truck to railheads, refineries, and industrial users.
• Agriculture: Cattle, sheep, hay, and other agricultural products are hauled to markets across the region, relying on rural state highways.
• Manufacturing and logistics: I‑80 and I‑25 form indispensable freight links between the West and Midwest for a wide variety of goods.

Tourism and Scenic Travel

Tourism is a major economic driver in Wyoming, and highways are the primary way visitors experience the state.

• Gateway communities such as Jackson, Cody, Dubois, Pinedale, and Sheridan rely on U.S. and state highways bringing in park visitors and outdoor recreationists.
• Designated scenic byways (e.g., Snowy Range, Cloud Peak Skyway, Beartooth Highway) highlight the state’s landscapes and draw scenic‑drive enthusiasts.
• Museum, cultural, and historical sites—such as Fort Laramie, Independence Rock, South Pass City, and the Oregon Trail ruts—are accessed mainly by state and U.S. highways.

Community Connectivity and Quality of Life

For residents, especially in small towns and rural areas, highways provide essential access to:

• Health care services, often located in regional hubs such as Casper, Cheyenne, Laramie, or Rock Springs.
• Educational institutions, including the University of Wyoming in Laramie and community colleges in several cities.
• Employment centers, particularly energy fields, mines, and tourism‑oriented towns.

Travel Tips for Using Wyoming Highways

Whether driving an interstate or a remote state route, travelers in Wyoming benefit from a few practical practices:

• Check conditions before departure: Use official road condition services to verify closures, chain laws, and weather impacts.
• Prepare for rapid weather changes: Even in late spring or early fall, high‑elevation routes can experience snow and freezing temperatures.
• Fuel up early and often: Do not assume frequent service stations in rural areas; distances between towns can exceed 50–70 miles.
• Watch for wildlife: Reduce speed and be vigilant around dawn and dusk, especially near river bottoms, forest edges, and known migration routes.
• Respect closures and advisories: Gates across I‑80 and mountain passes close for safety reasons; ignoring closures is illegal and dangerous.

Taken together, Wyoming’s interstates, U.S. highways, and state routes form a robust but demanding network. They connect a sparsely populated, resource‑rich, and scenic state to the rest of the country while offering travelers direct access to some of America’s most iconic landscapes and open spaces.