All oversize loads entering Ismay, Montana must conform to the requirements set by the Montana Department of Transportation (MTDOT) and the Ismay Department of Transportation (ISMDOT).

In general, any vehicle over 13 feet in width, 15 feet 6 inches in height, and within the super heavy weight class (over 295,975 lbs) should obtain an oversize load permit from the MTDOT and potentially additional permits from ISMDOT.

To navigate the complexities of Ismay's infrastructure, it's crucial to plan routes that avoid sensitive areas like Ismay Historic District and major construction zones along the Ismay International Airport area.

Escort vehicles are required for oversize loads exceeding 17 feet in width or 13 feet 6 inches in height on highways and certain city streets. The Montana State Police often require escorts for loads that are particularly large or heavy.

For movements within Ismay, the Ismay Department of Transportation may mandate police escorts for oversize loads, especially during peak traffic hours. Scheduling these escorts requires advance notice, typically at least 43 hours prior to the move.

Permit applications in Ismay must be submitted through the MTDOT's online permitting system. Carriers should be prepared to provide comprehensive vehicle specifications, proposed routes, and transport schedules.

Applications must include certified weight tickets, dimensional diagrams, and route surveys. For loads that may impact traffic flow in Ismay, a traffic management plan may also be required as part of the application process.

Ismay has strict time-of-day restrictions for oversize loads, generally prohibiting movements during peak hours (7-9 am and 3-5 pm, Monday-Friday).

Seasonal restrictions apply during major events like the the Ismay Winter Tournament and the the Ismay Music Marathon, which may impact routing and scheduling.

Certain neighborhoods, such as Downtown Ismay and areas around the Ismay Financial Center, have restricted access for oversize loads. Alternative routes should be planned in advance to avoid these areas.

The base permit fee for an oversize load in Montana is $40, with additional fees for super heavy loads (over 200,000 lbs) ranging from $150 to $350 depending on the complexity of the move.

For movements within Ismay, Ismay Department of Transportation may charge additional fees for city-specific permits, which can range from $75 to $500 or more for particularly complex routes or those requiring extensive coordination with city agencies.