---
title: Idaho Oversize & Overweight Permits (OS/OW) | ITD Superload | Alpine Truck Service
description: Expedited Idaho ITD oversize permits, Boise curfew routing, I-84/I-15 clearances, and ISP escorts. 24/7 commercial dispatch desk. Call (918) 607-6547.
image: https://www.alpinetruckservice.com/alpine-third-party-charges.webp
---

# Idaho Oversize, Overweight & Superload Permitting Services

Comprehensive commercial trucking permits and heavy haul compliance across Idaho.

## Agency & Permitting Authority
- **Agency**: Idaho Transportation Department (ITD)
- **Portal**: ITD Commercial Vehicle Services Portal
- **Regulatory Advisory**: State DOT regulations and permit processing queues are determined by individual state transportation authorities and vary by agency workload. Carriers should verify active route advisories and state requirements prior to movement.

## Legal vs. Routine Permitted Dimensions
- **Legal Width**: 8' 6" | **Max Routine**: 16' 0"
- **Legal Height**: 14' 0" | **Max Routine**: 16' 0"
- **Legal Length**: 53' Semi-Trailer / 75' Overall | **Max Routine**: 120' 0"
- **Legal Gross Weight**: 80,000 lbs (up to 105,500 lbs on designated routes with standard axle spacing) | **Max Routine**: 150,000 lbs
- **Axle Limits**: Single: 20,000 lbs, Tandem: 34,000 lbs, Tridem: 42,500 lbs

## Permitting Scope & Services in Idaho
- **Routine Oversize (OS) Cab-Cards**: Single-trip authorizations for dimensions exceeding 8' 6" width or 14' 0" height.
- **Overweight (OW) Axle Permits**: Overload cab-cards for heavy machinery and configurations exceeding 80,000 lbs GVW.
- **Multi-Axle Superload Permits**: Specialized filings exceeding Over 150,000, including State DOT and certified partner bridge reviews, route surveys, and police escorts.
- **Annual & Blanket Fleet Permits**: Continuous-operation annual highway authorizations for construction fleets.
- **Temporary Trip & Fuel Permits**: 72-hour IRP vehicle registration and IFTA fuel tax credentials.
- **County, City & Toll Road Clearances**: Municipal authorizations and turnpike clearances.

## Superload Permitting & State Review Protocol
- **Weight Trigger**: Over 150,000 lbs GVW or exceeding Idaho standard axle weight limits
- **Width Trigger**: Over 16' 0" wide (over 18' wide requires specialized route clearance)
- **Height Trigger**: Over 16' 0" high
- **Length Trigger**: Over 120' 0" overall length
- **State & Partner Bridge Review**: Idaho Transportation Department (ITD) electronic systems and certified structural engineering partners evaluate axle load distribution across bridge structures upon submission.
- **Route Surveys & Clearances**: Required for extreme heights/widths to verify overhead physical clearances.
- **Utility & Escorts**: Coordinated wire lifts with power utilities and State Police / Highway Patrol escorts.

## Pilot Cars & Escort Vehicle Requirements
- **Front Escort**: Required over 12' 6" wide on two-lane highways
- **Rear Escort**: Required over 14' 0" wide on multi-lane highways or length exceeding 100' 0"
- **Height Pole**: Required over 15' 6" high (front escort with calibrated height pole)
- **Police Escort**: Idaho State Police (ISP) escort required over 18' 0" wide or 17' 0" high

## Metro Curfews & Travel Restrictions
- **Curfew Zones**:
  - Boise Metro (I-84, I-184, US-20/26): 7:00–8:30 AM & 4:00–5:30 PM M-F
  - Coeur d'Alene (I-90) during peak morning and evening commuter hours
- **Travel Rules**: Daylight only (1/2 hour before sunrise to 1/2 hour after sunset) for oversize loads. Night travel permitted for loads up to 10' wide and legal height on Interstate highways with proper lighting. Weekend travel allowed for loads up to 12' wide.

## Key Freight Corridors
- I-84 (Southern Idaho Freight Spine)
- I-15 (Eastern Idaho Intermountain Corridor)
- I-90 (Northern Idaho / Panhandle)
- US-95 (North-South Mountain Arterial)
- US-20 / US-26

## Frequently Asked Questions
### What is Idaho's legal height limit?
Idaho allows a legal height of 14'0" on all state and interstate highways without requiring an oversize permit.

### What are Idaho pilot car rules for wide loads?
Idaho requires 1 escort for loads over 12'6" wide on two-lane roads and over 14' wide on multi-lane highways. Height over 15'6" requires a lead escort with a height pole.

### Can oversize loads travel on weekends in Idaho?
Yes, loads up to 12' wide and legal height may travel on Saturdays and Sundays during daylight hours.

### How fast does ITD issue Idaho trucking permits?
ITD processes routine single-trip permits within 2–4 business hours through their commercial vehicle portal. Alpine submits applications immediately upon intake.

## Contact & Direct Dispatch
- **Direct Phone**: (918) 607-6547 (CALL: [918-607-6547](tel:9186076547))
- **Email**: [permits@alpinetruck.com](mailto:permits@alpinetruck.com)
- **Online Intake**: [alpinetruckservice.com/permits/idaho](https://www.alpinetruckservice.com/permits/idaho)