Missouri commercial vehicle weight limits follow the federal Interstate standard of 80,000 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. Missouri imposes seasonal weight restrictions on secondary state routes during spring thaw, typically February through April. Check MoDOT for current restricted routes. Oversize and overweight permits are available from MO DOT for loads exceeding standard limits. Verify current road-specific postings with the Missouri DOT before routing heavy loads.
Missouri imposes seasonal weight restrictions on secondary state routes during spring thaw, typically February through April. Check MoDOT for current restricted routes.
Check current restrictions at MO 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 Missouri on all routes where federal standards apply.
W = maximum weight in lbs · L = axle spacing in feet · N = number of axles
Missouri MoDOT issues oversize/overweight permits through the online permit system. Single-trip and annual permits available. Superloads require engineering review and pre-approved route analysis. Mississippi River bridge moves for oversize loads require specific bridge authorization from MoDOT. Kansas City metro area permits may require coordination with multiple jurisdictions.
Apply for Missouri OS/OW Permit →On Missouri Interstate highways, the maximum gross vehicle weight is 80,000 lbs — the federal standard. State routes and county roads follow the same standard limits outside spring restriction periods. Spring restrictions (February–April) reduce allowable weights on secondary routes. Overweight permits from MoDOT are required for loads exceeding standard limits.
Yes. Missouri imposes spring weight restrictions on secondary state routes typically from February through April during the spring thaw period. Interstate highways are not affected. State secondary routes and county roads post reduced limits during this period. Check MoDOT at modot.org for current restricted routes before routing heavy loads on non-Interstate Missouri roads.
The St. Louis area has multiple Mississippi River bridges with varying weight capacities. Standard legal loads can typically use major Interstate crossings. Oversize or overweight loads must be verified with MoDOT for specific bridge weight limits. Contact MoDOT for current bridge-specific weight ratings and routing guidance for heavy haul loads crossing the Mississippi in Missouri.
Missouri oversize/overweight permits are issued by MoDOT through the online permit portal at modot.org. Single-trip and annual permits are available. Spring restriction period limits permit issuance for secondary route movements. Superloads require engineering review. Mississippi River bridge crossings for oversize loads require specific MoDOT authorization.
Yes. Missouri provides weight accommodations for agricultural vehicles transporting farm commodities including grain, hay, and livestock on certain intrastate routes. Implements of husbandry are generally exempt from weight restrictions. Contact MoDOT for current exemption details and eligible routes.
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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: Missouri MO Department of TransportationLast reviewed: 2026-04