Transporters operating oversize loads in Chatham, Michigan must adhere to regulations enforced by both the Michigan Department of Transportation (MIDOT) and the Chatham Department of Transportation (CHADOT).

Permits are mandatory for vehicles exceeding standard dimensions of 11 feet in width, 15 feet 6 inches in height, or those weighing more than 241,750 lbs. Additional local permits may be required for specific routes within the city limits.

Due to Chatham's unique infrastructure constraints, carriers must exercise caution when navigating near the Chatham Financial Center and should plan alternate routes around Downtown Chatham during peak hours.

Escort vehicles are required for oversize loads exceeding 16 feet in width or 15 feet 0 inches in height on highways and certain city streets. The Michigan State Police often require escorts for loads that are particularly large or heavy.

For movements within Chatham, the Chatham Department of Transportation may mandate police escorts for oversize loads, especially during peak traffic hours. Scheduling these escorts requires advance notice, typically at least 66 hours prior to the move.

The Michigan Department of Transportation manages the primary application process for oversize permits, with supplementary permits required from Chatham Department of Transportation for transit through Chatham limits.

Required documentation for Chatham permits includes axle configuration diagrams, proof of insurance with appropriate coverage levels, and detailed transport plans. Engineering assessments may be required for loads exceeding standard weight thresholds on certain streets and bridges.

Chatham 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 Chatham Historical Festival and the the Chatham Annual Festival, which may impact routing and scheduling.

Certain neighborhoods, such as Downtown Chatham and areas around the Chatham River, 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 Michigan 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 Chatham, Chatham 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.