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Idaho · Oversize & Overweight

Idaho Oversize & Overweight Permits filed with ITD for you, 24/7

In Idaho, oversize, overweight and extra-length permits come from the Idaho Transportation Department (ITD). A load over 8 ft 6 in wide or 14 ft high needs one, and so does a truck over 80,000 lbs on the interstate; off the interstate Idaho allows up to 105,500 lbs. Routes are color-coded, and the color sets the travel hours and escort rules. Send us the load and route: our permit desk quotes the price and files it for you.

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What will an oversize permit in Idaho cost?

Enter your pickup and delivery locations, choose your permit type, and compare estimated permit costs across route options.

  1. Oversize and overweight permits across the lower 48 and DC
  2. State-by-state fee breakdown for each route option
  3. Order your permit or talk to a specialist
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Idaho rules

Idaho legal limits and permit rules

The size and weight Idaho allows without a permit, when a load needs escorts and when a permitted load may run.

Legal limits without a permit

Width
8 ft 6 in
Height
14 ft
Semitrailer
48 ft, 53 ft on the national network
Doubles, trailers
61 ft, 68 ft on the national network
Single axle
20,000 lbs
Tandem axle
34,000 lbs
Gross, interstate
80,000 lbs
Gross, off the interstate
Up to 105,500 lbs

Escorts and height poles

Route color
Sets the escort rules for each road
Annual permits
Escorts as shown on ITD's pilot/escort travel map
Driver can't see 200 ft behind
Rear escort
Over 16 ft high
Height pole, on every load
US-12, MP 74–174, loads under Forest Service review
Ambulances; law enforcement escorts possible

When you can move

Interstate and black-coded routes
24/7 up to 12 ft wide, 120 ft long and 15 ft high
Red-coded routes
Daylight only; until 2 p.m. Friday or the day before a holiday; no Saturday or Sunday travel
Rush hour, over 13 ft wide
No moves 6–9 a.m. and 4–6:30 p.m. Monday–Friday in the Boise valley and nine listed cities
Holidays
New Year's, Memorial Day, Independence Day, Labor Day, Thanksgiving, Christmas
Wind and visibility
Permit invalid en route in wind over 40 mph or visibility under 500 ft
Spring breakup
Axle limits can drop to 16,000, 14,000 or 12,000 lbs

Source: Idaho Code 49-1001 and 49-1010; IDAPA 39.03.01 Rules Governing Special Permits; ITD Truckers Handbook (December 2023). Your permit's own conditions always apply.

Which permit you need

Idaho permits for oversize and overweight loads

  1. One move

    Single-trip permit

    ITD issues oversize, overweight and extra-length single-trip permits for a one-off move.

  2. 12 consecutive months

    Annual permit

    Annual oversize permits go up to 16 ft wide, 15 ft 6 in high and 120 ft long. On red-coded routes the cap is 12 ft 6 in wide.

  3. Past 16 ft wide or 16 ft high

    Additional approval

    Idaho has no superload label. Over 16 ft wide on red and black routes, 18 ft on the interstate, 16 ft high or 120 ft long (150 ft on the interstate), the load needs department approval, which can take up to 24 working hours.

  4. Up to 129,000 lbs

    LCV annual permit

    Longer combination vehicles up to 129,000 lbs and 115 ft overall, on designated routes only.

Routes and road rules

Where Idaho routes add their own rules

Every port of entry is a stop, US-12 through the forest takes one big load at a time, and the city valleys close at rush hour.

  1. Idaho ports of entry

    Every oversize vehicle stops at each port on its route: Bonners Ferry, Huetter, Lewiston, East Boise, Horseshoe Bend, Marsing, Declo, Hollister, Inkom and Sage Junction.

    Before the stop:The permit is filed and in the cab.

  2. US-12, mileposts 74–174

    Through the Nez Perce–Clearwater forest, the US Forest Service reviews loads over 16 ft wide, 150,000 lbs or 150 ft long, and only one such load may be on the section at a time.

    Escort:Ambulances, and possibly law enforcement.

  3. Interstates and black-coded routes

    Loads up to 12 ft wide, 120 ft long and 15 ft high run 24 hours a day, seven days a week.

    Red-coded routes:Daylight only, off the road by 2 p.m. Friday and all weekend.

  4. Boise valley and nine cities

    Loads over 13 ft wide stay off the road 6–9 a.m. and 4–6:30 p.m. on weekdays on I-84 mileposts 26–59 and in Coeur d'Alene, Eagle, Emmett, Garden City, Idaho Falls, Middleton, Pocatello, Star and Twin Falls.

    Departure:We set start times outside both windows.

Idaho loads

Idaho permits for the loads Idaho hauls

Beside single-trip and annual permits, ITD issues industry permits for farm freight, winter equipment and housing.

  1. Farm and mill freight

    Hay bales and kiln lumber

    An industry permit written for hay bale and kiln lumber loads.

  2. Winter equipment

    Snowplows

    Snowplow moves run on a permit type of their own.

  3. Farm equipment

    Implements of husbandry

    ITD sets a separate industry permit for implements of husbandry.

  4. Housing

    Manufactured homes

    Manufactured home moves have their own industry permit in Idaho.

How it works

Your Idaho permit in three steps

  1. Send the load and route

    Truck, trailer, dimensions, weight, origin and destination. Your fleet details are saved for next time.

  2. We check and file

    Our permit desk checks the Idaho rules for your load and files with ITD Motor Carrier Services.

  3. Get your permit

    You get the permit PDF, a written route and an interactive route map to share with the driver.

From our permit desk

What we check before filing in Idaho

  1. What color is each road?

    Red, black or interstate decides the travel hours, the annual width cap and the escort rules. We check the color of every segment before we file.

  2. Heavy loads wait on bridge analysis

    Up to 3 business days at or under 250,000 lbs, up to 10 above it, and a third-party analysis over 800,000 lbs. We file early enough to keep your pickup date.

  3. Wind can void the permit mid-trip

    An Idaho permit becomes invalid en route in wind over 40 mph or visibility under 500 ft. We plan the run with room to park and wait it out.

FAQ

Idaho oversize permit questions

How long can trailers be in Idaho without a permit?

A semitrailer 48 ft, or 53 ft on the national network. Doubles 61 ft of trailers and 75 ft overall, or 68 ft of trailers on the national network. Saddlemounts 97 ft, a single motor vehicle 45 ft, with 4 ft of front and 10 ft of rear overhang.

How much does an Idaho oversize permit cost?

It depends on the permit type, size, weight and route. Put your route into our permit cost calculator for an estimate, or send us the load and our permit desk quotes the exact price before filing.

How much can a truck gross off the interstate in Idaho compared with on it?

Idaho caps the interstate at 80,000 lbs but allows up to 105,500 lbs off it, with axles held to 20,000 lbs single and 34,000 lbs tandem by the bridge table. LCVs reach 129,000 lbs on designated routes under an annual permit.

What do red and black route colors mean for an Idaho oversize load?

On red-coded routes a load moves in daylight only, stops at 2 p.m. Friday or the day before a holiday and does not travel on weekends; annual permits are capped at 12 ft 6 in wide there. On interstate and black-coded routes, loads up to 12 ft wide, 120 ft long and 15 ft high run around the clock.

How long does bridge analysis take on a heavy Idaho load?

Up to 3 business days at or under 250,000 lbs and up to 10 business days above it. Over 800,000 lbs, a third-party analysis is required.

Does Idaho issue superload permits?

Not by that name. Loads over 16 ft wide on red and black routes, 18 ft on the interstate, 16 ft high or 120 ft long (150 ft on the interstate) need additional approval, which can take up to 24 working hours. On two-lane roads, a load over 18 ft wide, 150 ft long or 16 ft high also needs a traffic control plan.

How does Route One GO get my Idaho permit?

Send us the truck, trailer, load dimensions, axle weights and route. Our permit desk checks the route colors and the Idaho rules, files with ITD, and sends you the permit with a route map. Requests are taken 24/7.

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Need a permit in Idaho for this load?

Send the details once. We file with ITD Motor Carrier Services, plus every other state on your route.

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