Utah Truck Weight and Size Limits
Legal limits for a truck in Utah without a permit: Interstate axle and gross weights, height, width, and semitrailer length, each with its official source.
Utah limits at a glance
| Limit | Utah | Source |
|---|---|---|
| Interstate gross weight | 80,000 lb | 23 CFR 658.17, Weight (eCFR) |
| Interstate single axle | 20,000 lb | 23 CFR 658.17, Weight (eCFR) |
| Interstate tandem axle | 34,000 lb | 23 CFR 658.17, Weight (eCFR) |
| Width (National Network) | 102 in | 23 CFR 658.15, Width (eCFR) |
| Height | 14 ft | Utah DOT, Legal Height, Width, & Length |
| Semitrailer length | 53 ft (no overall length limit on a tractor-semitrailer when the trailer is 53 ft or less) | Utah DOT, Legal Height, Width, & Length |
| Grandfathered semitrailer length | 48 ft | 23 CFR part 658, Appendix B, Grandfathered Semitrailer Lengths (eCFR) |
Interstate weight limits
Federal law sets the Interstate limits at 20,000 lb on a single axle, 34,000 lb on a tandem, and 80,000 lb gross, with the bridge formula on every axle group (23 CFR 658.17). States may keep higher limits they had before the federal limits took effect ("grandfather rights").
Grandfathered: up to 129,000 lb GVW on I-15, I-70, I-80, I-84, I-215, and UT-201.
FHWA on Utah: Utah has a grandfather provision under Federal law (23 CFR Part 658, Appendix C) to allow vehicles to operate up to 129,000 lbs. GVW on parts of the interstate system. See the Routes section for a full description of the routes to which this grandfather provision applies.
Bridge formula check with Utah limits
A 5-axle tractor-trailer is filled in. Change the spacings and weights to match your rig; the limits for single axles, tandems, and gross are Utah's Interstate limits.
Your result
Utah limits off the Interstate
FHWA's summary of Utah law for trucks in regular operation (no permit), including non-Interstate highways. It reflects state law as of October 1, 2012; check the state for later changes.
- Single axle
- 20,000 lbs.
- Tandem axle
- 34,000 lbs.
- Gross weight
- 80,000 lbs.
- Other
- 10,500 lbs. per wheel
Where Utah allows more than federal limits
- Utah State statute provides for commodity exemptions for logs and poles, livestock, and raw grain.
Height, width, and length
- Width: 102 inches. States may not set a width limit of more or less than 102 inches on the National Network (23 CFR 658.15(a)). Permits can allow wider loads.
- Height: 14 ft. There is no federal height limit; each state sets its own.
- Semitrailer length: 53 ft (no overall length limit on a tractor-semitrailer when the trailer is 53 ft or less)
- Grandfathered semitrailer length: 48 ft. The minimum semitrailer length the state must allow in a tractor-semitrailer combination on the National Network, based on lengths legal in the state on December 1, 1982. Federal law also requires at least 48 ft (23 CFR 658.13(b)(1)).
Over these limits you need a permit. Utah oversize/overweight permits (801-965-4892).
Utah compared with neighboring states
| State | Gross | Single | Tandem | Height | Semitrailer |
|---|---|---|---|---|---|
| Utah | 80,000 lb | 20,000 lb | 34,000 lb | 14 ft | 53 ft |
| Arizona | 80,000 lb | 20,000 lb | 34,000 lb | 13 ft 6 in | 57 ft 6 in |
| Colorado | 80,000 lb | 20,000 lb | 36,000 lb | 14 ft 6 in | No separate semitrailer length for a l… |
| Idaho | 80,000 lb | 20,000 lb | 34,000 lb | 14 ft | 48 ft |
| Nevada | 80,000 lb | 20,000 lb | 34,000 lb | 14 ft | Pending |
| New Mexico | 86,400 lb | 21,600 lb | 34,200 lb | Pending | Pending |
Sources
Source: 23 CFR 658.17, Weight (eCFR) · Last verified Sep 28, 2026
Source: FHWA, Compilation of Existing State Truck Size and Weight Limit Laws (Report to Congress, May 2015), Appendix A: Utah · Effective Oct 1, 2012 · Last verified Sep 28, 2026
Source: FHWA, Compilation of Existing State Truck Size and Weight Limit Laws (Report to Congress, May 2015), Appendix B: Summary of State Exceptions to Federal Truck Weight Limits · Effective Oct 1, 2012 · Last verified Sep 28, 2026
Source: 23 CFR 658.15, Width (eCFR) · Last verified Sep 28, 2026
Source: 23 CFR part 658, Appendix B, Grandfathered Semitrailer Lengths (eCFR) · Last verified Sep 28, 2026
Source: Utah DOT, Legal Height, Width, & Length · Last verified Sep 28, 2026
Source: FHWA, Oversize/Overweight Load Permits: State permit contacts · Last verified Sep 28, 2026
Limits change, and cities, counties, and posted bridges can set lower ones. Check with Utah before you run a load near the limits. Page data last verified Sep 28, 2026.