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Iowaoperating inMissouri
Permits Honored — recognizes your home-state oversize/overweight permit

Missouri

Interstate GVW
80,000 lbs
Height Limit
14 ft
Width Limit
8 ft 6 in
Permits Honored
Yes

Weight Limits

Missouri interstate GVW limit: 80,000 lbs. Per-axle limits: Single axle 20,000 lbs, Tandem axle 34,000 lbs, Tridem axle 42,000 lbs. Federal bridge formula applies. Enforcement tolerance: No general tolerance on interstates.

Size Limits

Height: 14 ft. Width: 8 ft 6 in. Trailer length: 53 ft (semitrailer). Overall combination length: No overall limit for tractor-semitrailer.

Oversize/Overweight Permits

Oversize/overweight permits through MoDOT Carrier Express online system only Fees: Single-trip: $15; Annual: varies by weight. Iowa oversize/overweight permits are honored under reciprocal agreements. Verify specific terms before travel. Apply online: https://www.modot.org/OSOW Enforcement: MoDOT and MSHP enforcement; weigh stations; graduated fine schedule.

Exemptions

Agricultural: Farm vehicles exempt on state highways; agricultural products allowed higher weights during harvest.

Official Source

For the most current weight and size regulations, permit applications, and seasonal restriction updates, visit the official Missouri DOT page at https://www.modot.org/OSOW. Contact the Missouri Department of Transportation for specific routing questions.

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Related guides

Missouri Permits: https://www.modot.org/OSOW
Law last updated: 2025Row last reviewed: May 9, 2026

Weight and size limits are subject to change. Always verify current limits on the official state DOT website before travel. Seasonal restrictions, bridge postings, and local ordinances may further reduce allowable weights. Data reflects 2025-2026 regulations where available.