Oregon commercial vehicle weight limits follow the federal Interstate standard of 105,500 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. Oregon imposes seasonal weight restrictions on secondary roads during spring thaw, typically February through April. Mountain pass routes may have year-round restrictions on certain grades and bridges. Logging roads in the Coast Range and Cascades can have specific seasonal weight windows. Check ODOT Motor Carrier Transportation for current restricted routes before routing heavy loads off the Interstate and primary highway system. Oversize and overweight permits are available from OR DOT for loads exceeding standard limits. Verify current road-specific postings with the Oregon DOT before routing heavy loads.
Oregon imposes seasonal weight restrictions on secondary roads during spring thaw, typically February through April. Mountain pass routes may have year-round restrictions on certain grades and bridges. Logging roads in the Coast Range and Cascades can have specific seasonal weight windows. Check ODOT Motor Carrier Transportation for current restricted routes before routing heavy loads off the Interstate and primary highway system.
Check current restrictions at OR DOT →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 Oregon on all routes where federal standards apply.
W = maximum weight in lbs · L = axle spacing in feet · N = number of axles
Oregon oversize/overweight permits and weight-mile tax (WMT) trip permits issued by ODOT Motor Carrier Transportation at oregon.gov/odot/MCT/Pages/tripermit.aspx. All carriers entering Oregon must either have an Oregon WMT account or purchase a trip permit online before entering the state. Single-trip permits for most oversize/overweight loads. Annual permits for qualifying routine operations. Superload permits require engineering review. Oregon's WMT system means permit costs include both oversize/overweight authorization and mileage-based tax.
Apply for Oregon OS/OW Permit →On designated Oregon state routes, the maximum gross vehicle weight is 105,500 lbs — significantly above the federal 80,000 lb Interstate standard. Oregon also allows 48,000 lbs on tridem axle configurations. Interstate highways remain at 80,000 lbs. These higher limits are critical for Oregon's timber and agricultural industries. Verify which specific routes qualify at ODOT before operating above 80,000 lbs.
Yes. Oregon imposes seasonal weight restrictions on secondary roads typically February through April during the spring thaw. Mountain pass routes may have year-round restrictions on specific grades. Logging roads in the Coast Range and Cascades can have seasonal weight windows tied to soil moisture conditions. Check ODOT Motor Carrier Transportation at oregon.gov/odot/MCT for current restriction status before routing heavy loads off primary highways in spring.
Oregon charges a weight-mile tax (WMT) on all commercial motor vehicles instead of traditional fuel taxes. Oregon-based carriers maintain WMT accounts with ODOT and file mileage reports. Out-of-state carriers entering Oregon must purchase trip permits online before entering — these can be obtained at oregon.gov/odot/MCT/Pages/tripermit.aspx. Failure to have a valid WMT account or trip permit results in fines at Oregon weigh stations. Trip permits must be obtained before entering the state — not after arriving.
Oregon oversize/overweight permits are issued by ODOT Motor Carrier Transportation at oregon.gov/odot/MCT/Pages/tripermit.aspx. For out-of-state carriers, a WMT trip permit and an oversize/overweight permit may both be needed. Annual permits are available for qualifying operations such as logging trucks. Superloads require engineering review and route pre-approval. Mountain pass restrictions and spring weight restrictions can affect permit routing — check ODOT road conditions.
Oregon allows 48,000 lbs on tridem axle configurations on designated state routes — higher than most US states and a significant advantage for logging and aggregate haulers. The higher tridem limit combined with the 105,500 lb GVW allowance allows Oregon logging trucks to maximize payload on designated routes. Interstate highways use the federal standard tridem limit. Verify route-specific tridem authorizations with ODOT Motor Carrier Transportation.
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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: Oregon OR Department of TransportationLast reviewed: 2026-04