Maximum Load Dimensions with permits in Idaho

Validity: Idaho Oversize Permits are valid for Five Days.

Length: Up to 110 feet

Width: Up to 16 feet

Height:  15 feet 6 inches

Weight:

• Steer axle: up to 600 pounds per inch of tire tread (13,200 pounds for 11-inch tires
• Single axle: 22,000 to 33,000 pounds
• Tandem axle: 38,500 to 56,000 pounds
• Tridem axle: 48,000 to 70,500 pounds

Note: The specific weight allowances depend on the classification of the road being used. Interstate highways typically permit higher weight limits.

Superload: Any vehicle or load exceeding these limits may be categorized as a Superload and will require special authorization

Escort or Pilot Car Requirements in Idaho

On Two-Lane Roads:

• Length: If length exceeds 100 feet, one escort vehicle must accompany the load
• Overhang: For rear overhangs that go beyond 25 feet, one escort vehicle is needed
• Width:
  Over 12 feet, one escort required
  Over 14 feet, two escorts required
  Over 16 feet, may require three escorts
• Height: When height exceeds 16 feet, a single escort is mandatory
  On Interstate Highways:
• Length: In cases where the length is over 120 feet, one escort must be present
• Overhang: If the rear overhang extends past 25 feet an escort is require
• Width:
  Over 15 feet one escort required
  Over 16 feet may require two or more escorts
• Height: Height over 16 feet one escort required

Sings, Lights and flags Requirements and Additional Information in Idaho

Sings, Lights and flags Requirements: Requirements for signage and lighting are specified on the Idaho oversize permit. All overwidth loads must display “Oversize Load” signs. Red or fluorescent orange flags must be placed at the outermost corners and ends of the load, including the rear if the overhang exceeds 4 feet. For overweight loads only (without overwidth), signs or flags are generally not required.

Miscellaneous rules: All lift axles must remain lowered (in contact with the ground) when axle weights exceed the legal limits. Depending on the route and specific conditions, attachments like blades or buckets may be removed and carried on the same load to comply with regulations. Final decisions are made by the state on a case-by-case basis

Idaho Oversize Permits Cost:

Depending on the type of permission, Idaho oversize permits have different costs.
In Idaho, the cost of oversize permits varies depending on the type and duration of the permit. A single trip oversize permit can start at $28, while permits for loads exceeding 16 feet width, 16 feet height, or 110 feet length can cost $71. Oversize permits for two trips within 7 days can be $89, and annual oversize permits are around $43. Overweight permits also have different fees, with a single trip permit starting at $71. Additionally, there are specific fees for overweight and oversize combination permits, which can range from $103 to $128 depending on the duration.
Detail of some common Idaho oversize permit costs:

• Single Trip Oversize: $28
• Single Trip Oversize (loads exceeding 16ft width, height, or length): $71
• Oversize for 2 trips within 7 days (loads exceeding 16ft): $89
• Oversize for 2 trips: $33
• Annual Oversize: $43
• Overweight Single Trip: $71
• Overweight and Oversize Single Trip: $103
• Overweight and Oversize Annual: $128

It’s important to note that these are just examples, and the exact cost of an oversize permit in Idaho can depend on various factors, including the specific load dimensions, weight, and the type of permit required.