Lewistown, Montana regulations require all heavy haul operations to comply with the Montana Department of Transportation (MTDOT) guidelines as well as local ordinances administered by the Lewistown Department of Transportation (LEWDOT).

Heavy haul permits are required for any load exceeding 12 feet in width, 15 feet 6 inches in height, or 209,596 lbs in gross vehicle weight. These dimensions are strictly enforced throughout Lewistown, particularly in high-traffic areas.

Special consideration must be given to route planning to avoid the Lewistown Harbor and the vicinity of Lewistown Bridge, which have infrastructure limitations or heavy pedestrian traffic that may impede oversized loads.

Escort vehicles are required for oversize loads exceeding 15 feet in width or 14 feet 0 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 Lewistown, the Lewistown Department of Transportation may mandate police escorts for oversize loads, especially during peak traffic hours. Scheduling these escorts requires advance notice, typically at least 54 hours prior to the move.

To apply for an oversize load permit in Montana, companies must submit their applications through the Montana Department of Transportation's permit portal. Additional permits for Lewistown may require submission to Lewistown Department of Transportation.

Documentation required includes detailed route plans, load dimensions, and weight certificates. For super heavy loads, a detailed engineering analysis may be necessary to ensure that the load can be safely transported without damaging city infrastructure.

Lewistown has strict time-of-day restrictions for oversize loads, generally prohibiting movements during peak hours (6-9 am and 4-6 pm, Monday-Friday).

Seasonal restrictions apply during major events like the the Lewistown Film Exposition and the the Lewistown Cultural Parade, which may impact routing and scheduling.

Certain neighborhoods, such as Downtown Lewistown and areas around the Lewistown Tunnel, 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 Lewistown, Lewistown 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.