Idaho Oversize/Overweight Permits

Idaho Overweight PermitsPermit Types

Call (888) 799-8858 for Idaho overweight/oversize permits.

1. Single-Trip Permits – Valid for 5 Days

  • Non-reducible Oversize Single Trip Permit
  • Non-reducible Oversize/Overweight Single Trip Permit

2. Annual Permits

  • Non-Reducible Oversize
  • Non-Reducible Oversize/Overweight
  • Non-Reducible Disabled Vehicle
  • Snowplow
  • Non-Reducible Self-Propelled
  • Reducible Canadian/Eastport
  • Extra Length/Excess Weight Up To 129,000 lbs.
  • Reducible Oversize Load

 

Operating Time

All oversize/overweight haulers may operate from one-half hour before sunrise to one-half hour after sunset, including Saturdays and Sundays (for a majority of routes). Travel is allowed 24/7 (for a majority of routes) for loads which measure up to and including 10′ wide, 120′ long, or 14’6″ tall with lighting as specified on the permit. Weekend travel is allowed on the majority of routes during daytime hours.

LEGAL LIMITS

Length
  • Single Motor Vehicle – 45′
  • Semi-trailer – 53′ on National Network
  • Trailer – 48′ on non-national Network (“non-designated”)
  • Double trailers – 61′ of trailers or 75′ overall
  • Overall length – 75′
Width 8’6″
Height 14′
Weight (GVW is 80,000 lbs)
  • Single – 20,000 lbs.
  • Tandem – 34,000 lbs.
  • Tridem – depends on the spacing
  • Steer – 600 pounds per inch of tread width (13,200 lbs with 11″ tires)
Overhang Front – 4’Rear – 10′

PERMIT LIMITS

Width 16′
Height 15’6
Weight
  • Single – 33,000 lbs to 22,000* lbs
  • Tandem – 56,000 lbs to 38,500* lbs
  • Tridem – 70,500 lbs to 48,000* lbs
  • Steer – 600 pounds per inch of tread width (13,200 pounds for 11″ tires)

*Group weight maximums depend on route classification, with Interstate routes getting the highest. Loads exceeding these dimensions are considered Super Loads.
Length 110′

 

Escorts/Signs Requirements

On 2-lane Highways (Black Coded)

Width 
  • Over 12′ – (Needs 1 escort pilot car)
  • Over 14′ – (Needs 2 escort pilot cars)
  • Over 16′ – (May require 3 escort pilot cars)
Height Over 16′ – (Needs 1 escort pilot car)
Length Over 100′ – (Needs 1 escort pilot car)

 

On Interstate System

Width
  • Over 15′ – (Needs 1 escort pilot car)
  • Over 16′ – (May require 2 or 3 escort pilot cars)
Height Over 16′ – 1 escort pilot car
Length Over 120′ – (Needs 1 escort pilot car)
Overhang Over 25′ rear – (Needs 1 escort pilot car)

 

PLEASE NOTE:

-A third escort (in advance) may be needed with a load of such extreme dimensions for a tour of travel as to require holding opposing traffic at turnouts and intersections.

-Oversize loads which individually would require an escort may travel in convoy (not over four loads and not mobile homes) require two escort vehicles (front and rear).

-The maximum width of units in a convoy is 14’6″, with a maximum length of 120′ on the Interstate System or on black-coded routes on the map.

–The maximum width of units in a convoy is 12’6″, with a maximum length of 100′ on red-coded routes.

SIGNS, FLAGS & LIGHTS

Requirements are specified on the Idaho permit. “Oversize Load” signs are required on all overwidth loads. Flags are required on all four corners and extremities of overwidth loads and on rear overhang exceeding 4′. Overweight-only loads do not require signs or flags.

RESTRICTED TRAVEL

If over 13′ wide: movement is prohibited in Boise, Caldwell, Coeur d’Alene, Idaho Falls, Lewiston, Nampa, Pocatello, Twin Falls, Garden City, and Chubbuck between 6:30 – 8:30 a.m., 11:30 – 1:30 p.m., and 4:00 – 6:00 p.m. Holiday travel restrictions are based on dimensions.

You can also obtain any trip and fuel permits you may need with our sister site!