Utah Truck Weight Limits

How much a truck can weigh in Utah

The legal max is 80,000 pounds (Utah Code 72-7-404). Utah grandfathers 129,000-pound longer combination vehicles onto designated routes, Interstate included (23 CFR 658 App. C). Overweight fines are $50 plus 5 cents a pound on gross overage, and up to 13 cents a pound on axle overage for the heaviest loads (Utah Code 72-7-404).

Axles, off-Interstate, and permits

• Off the Interstate: 80,000 lb base; up to 129,000 lb on designated routes with a longer-combination-vehicle permit
• Single axle: 20,000 lb
• Tandem axle: 34,000 lb (two tandem sets may each carry 34,000 lb if 36 ft or more apart)
• With a permit: 129,000 lb on designated routes (longer combination vehicles); non-divisible superloads higher case-by-case
• Utah's 129,000-lb LCV weight is grandfathered under 23 CFR 658 App. C. The overweight fine also carries the standard state surcharge/court assessment on top of the statutory amount.

Posted bridge and road limits

UDOT and local agencies post bridges with MUTCD 'WEIGHT LIMIT X TONS' signs. Tons are 2,000-pound short tons, so 20 TONS is 40,000 pounds. A posted limit beats your legal weight. A legal 80,000-pound truck may not cross a bridge posted below its weight and has to detour. Crossing an under-posted bridge is a separate violation and can bring repair liability.

What running heavy costs

$50 base plus a per-pound charge (Utah Code 72-7-404). Gross-weight overage: nothing on the first 2,000 over, then a flat $0.05/lb on everything over. Axle overage climbs by bracket: $0.04/lb (2,001-5,000), $0.05/lb (5,001-8,000), $0.06/lb (8,001-12,000), $0.07/lb (12,001-16,000), $0.09/lb (16,001-20,000), $0.11/lb (20,001-25,000), $0.13/lb (over 25,000). You pay the gross total or the axle total as it applies.

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