WA➜ID

The Route: Washington to Idaho

This guide outlines a common and efficient route for commercial truck drivers traveling from Washington to Idaho. The primary Interstate used is I-90.

Starting Point: Assuming a starting point in Western Washington (e.g., Seattle), the initial phase involves navigating east on I-90.

I-90 East: Proceed east on I-90, passing through major cities like Spokane, Washington. This stretch offers generally good road conditions, but be aware of increasing elevation as you approach the Idaho border.

Idaho Entry: Upon crossing the Washington/Idaho state line, you remain on I-90, continuing eastward into Idaho. Significant cities along this route include Coeur d'Alene and Kellogg.

Destination: The final destination within Idaho will determine the specific exit off of I-90. If your destination is in the southern portion of the state, consider alternative routes from the I-90 corridor after assessing real-time traffic and road conditions to avoid unnecessary mileage. For example, you may consider taking US-95 south from Coeur d'Alene, ID if heading towards Boise.

Alternative Routes: While I-90 is the most direct and frequently used route, consider using secondary highways such as US-2 for sections where I-90 might face closures due to weather or construction. However, remember that secondary routes may have lower speed limits and more stringent weight restrictions.

Compliance & Permits

Drivers operating commercial vehicles between Washington and Idaho must adhere to all applicable federal and state regulations.

Weigh Stations & Ports of Entry:

• Washington Weigh Stations: Be prepared for weigh stations located along I-90 in Washington. Locations can vary, so pay close attention to signage. The Washington State Patrol Commercial Vehicle Enforcement often conducts mobile patrols and temporary checkpoints.
• Idaho Weigh Stations: Idaho also maintains weigh stations along I-90 and other major highways. Be aware of these locations and ensure compliance with weight and safety regulations.

Permits:

• Idaho Oversize/Overweight Permits: If you are hauling loads that exceed standard size or weight limits in Idaho, you will need to obtain the appropriate oversize/overweight permits from the Idaho Transportation Department (ITD). Ensure you have these permits in hand before entering the state.
• Washington Permits: Similarly, Washington requires permits for loads exceeding legal dimensions or weight. Check the Washington State Department of Transportation (WSDOT) regulations for specifics.
• IFTA/IRP: Ensure all IFTA fuel tax and IRP registration are up to date.

Risks & Hazards

This route presents various seasonal weather risks and potential hazards.

Winter:

• Snow and Ice: I-90 crosses mountainous terrain in both Washington and Idaho. Winter conditions can bring heavy snow, ice, and chain requirements. Monitor weather forecasts and road conditions closely. Be prepared to chain up when required and exercise extreme caution.
• Avalanche Zones: Be aware of potential avalanche zones, especially along I-90 through the mountain passes. Heed any warnings or closures issued by transportation authorities.

Summer:

• Wildfires: Wildfires are a significant concern in the summer months. Smoke can reduce visibility, and road closures may occur. Stay informed about fire activity and adjust your route if necessary.
• Heat: High temperatures during summer can cause tire blowouts and place additional strain on your vehicle. Ensure proper tire inflation and regular vehicle maintenance.
• Construction: Road construction is common during the summer months, leading to delays and lane closures. Check for construction updates before your trip and allow for extra travel time.