Wyoming commercial vehicle weight limits follow the federal Interstate standard of 117,000 lbs gross, 20,000 lbs per single axle, and 34,000 lbs per tandem axle group. The federal bridge formula (23 U.S.C. 127) applies on all routes. No seasonal weight restrictions on Interstate highways. Oversize and overweight permits are available from WY DOT for loads exceeding standard limits. Verify current road-specific postings with the Wyoming DOT before routing heavy loads.
The federal bridge formula limits the weight on any group of axles based on the distance between the outermost axles in the group. It applies in Wyoming on all routes where federal standards apply.
W = maximum weight in lbs · L = axle spacing in feet · N = number of axles
WYDOT issues oversize/overweight permits. Apply online through the WYDOT permit portal at dot.state.wy.us. Single-trip permits required for loads exceeding applicable limits. Annual permits available for qualifying recurring heavy operations including energy sector and mining transport. Superloads require engineering review and route approval. Wyoming's energy sector generates significant permit activity for large mining and drilling equipment moves.
Apply for Wyoming OS/OW Permit →Wyoming allows up to 117,000 lbs gross vehicle weight on certain designated state highways — the highest legal GVW in the continental US. This extraordinary allowance reflects Wyoming's dominant energy and mining industries. On Interstate highways, the federal standard of 80,000 lbs applies. Overweight permits from WYDOT are required for loads exceeding applicable limits on any given route.
No. Wyoming does not impose seasonal spring weight restrictions on Interstate highways or major state routes. The state's semi-arid climate and geography mean roads generally are not subject to significant freeze-thaw damage on major routes. However, I-80 and other Wyoming routes close periodically due to blizzards and high winds — these are weather-related operational closures, not weight restriction programs.
The 117,000 lb GVW allowance applies on specific designated Wyoming state highways — not on all roads. Operators must comply with Wyoming's axle weight requirements for their specific vehicle configuration and may need a WYDOT overweight permit depending on the route and configuration. Contact WYDOT at dot.state.wy.us to confirm which routes allow 117,000 lb operation and what permit requirements apply to your specific vehicle and load.
Wyoming oversize/overweight permits are issued by WYDOT through the online permit portal at dot.state.wy.us. Single-trip permits are required for loads exceeding applicable weight or dimension limits. Annual permits are available for qualifying recurring heavy operations. Wyoming's energy sector generates significant permit activity for large mining equipment, drilling rigs, and wind turbine component moves. Superloads require engineering review and route approval.
I-80 in Wyoming, particularly the stretch between Cheyenne and Laramie (crossing the Sherman Hill summit at 8,640 feet), is one of the most weather-affected major highways in the US. High winds exceeding 60 mph are common in fall and winter, regularly causing high-profile vehicle closures and rollover incidents. The highway also closes completely during severe blizzards. WYDOT issues wind advisories via variable message signs and the wyoroad.info website. CDL operators should monitor conditions before every I-80 trip in Wyoming, particularly October through April.
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Disclaimer
The information on this page is compiled from publicly available government sources and is provided for general informational purposes only. TruckRadar is an independent search engine — we are not affiliated with any government agency and this content does not constitute legal or compliance advice. Regulations change frequently; always verify current requirements directly with the official source before making compliance decisions.
Official source: Wyoming WY Department of TransportationLast reviewed: 2026-04