Size and Weight Information
Interstate (I-70, I-25, I-76)
Non-Interstate
Single Axle Limit
20,000 lbs
20,000 lbs
Tandem Axle Limit
36,000 lbs
40,000 lbs
Gross Weight Limit
80,000 lbs
(Subject to Federal Bridge Weight Formula)
85,000 lbs
(Subject to State Bridge Weight Formula)
Note: Triple Axles (or more) do not have a defined limit but the vehicle(s) still cannot exceed gross weight limits.
Gross Weight
The maximum gross weight is determined by finding the maximum bridge weight for the unit or combination that can be found here:
- Federal Bridge Weight Calculator
W = 500 [LN/N-1 + 12N + 36]
W = the overall gross weight on any group of two or more consecutive axles to the nearest 500 pounds.
L = the distance in feet between the outer axles of any group of two or more consecutive axles.
N = the number of axles in the group under consideration.
- State Bridge Weight Formula
- Weight=1000(Length+40)