SD➜ID

The Route: South Dakota to Idaho Trucking Guide

This route guide outlines a common and efficient path for commercial truck drivers traveling from South Dakota to Idaho. Always consult up-to-date road conditions and adjust your route as necessary based on real-time information.

The primary Interstate Highways for this journey are:

• I-90 West: This will be your main artery across South Dakota, Montana, and into Idaho.
• I-15 South (Near Butte, MT): A short connection south to join I-90 further west, avoiding a less efficient route on I-90 to the north.
• I-84 West (near Boise, ID): Connects you to various locations in southern Idaho.

General Route Description: Starting in South Dakota, head west on I-90. Continue on I-90 through Montana, noting that portions of the route climb into mountainous terrain. Near Butte, Montana, briefly take I-15 south before reconnecting with I-90 headed west towards Idaho. In Idaho, take I-84 West when appropriate for your destination to reach southern Idaho cities, or stay on I-90 west for northern Idaho destinations.

Compliance & Permits

As a commercial vehicle operator, you are responsible for adhering to all applicable federal and state regulations. Be sure to have your CDL, medical card, and vehicle registration readily available.

Weigh Stations and Ports of Entry:

Expect to encounter weigh stations along I-90 in both Montana and Idaho. Specific locations include, but are not limited to:

• South Dakota: Locations vary, check current DOT information.
• Montana: Westbound weigh station near Hardin and eastbound near Wibaux
• Idaho: Eastbound Port of Entry near Huetter (Post Falls), westbound weigh station near Murtaugh (I-84).

Always obey posted signage and weigh station instructions. PrePass or other bypass systems may expedite the process at participating locations.

Permits:

• Montana Oversize/Overweight Permits: If your load exceeds standard legal dimensions or weight limits in Montana, you will need to obtain the necessary permits prior to entry. Failure to do so can result in significant fines and delays. Specifics vary depending on the load dimensions/weight.

This is not an exhaustive list, and you should research specific permit requirements based on your load and the states you will be operating in.

Risks & Hazards

This route presents several potential hazards throughout the year, and awareness is crucial for safe driving.

• Winter Weather: The Rocky Mountains are notorious for heavy snowfall, ice, and blizzard conditions, especially between late fall and early spring. Be prepared for chain requirements, reduced visibility, and potential road closures. Monitor weather forecasts closely and carry chains when necessary. Ensure you have adequate winter supplies in your truck.
• High Winds: Open plains in South Dakota and Montana can experience strong crosswinds, especially during the spring and fall. Reduce speed and maintain a firm grip on the steering wheel in windy conditions.
• Wildlife: Deer and other wildlife are common along this route, particularly at dawn and dusk. Be vigilant and reduce speed in areas known for wildlife crossings.
• Mountain Driving: The mountainous sections of I-90 in Montana and Idaho require careful attention to braking techniques and gear selection. Avoid overheating your brakes on long descents. Use lower gears to control your speed.
• Summer Heat: The temperature on I-90 in South Dakota, Montana and Idaho can rise during the summer, so ensure your truck's cooling system is in good working condition.