Seasonal Weight Restriction

Seasonal Weight Restrictions

One of the most common business interactions with a county road agency concerns seasonal weight restrictions – sometimes called “frost laws.” 

While roads are concrete and asphalt and look indestructible, they can actually be quite fragile in late winter as frost comes out of the ground.  Even strong late-winter sunlight on the dark paved surface has a significant impact on a road.

As frost melts beneath a paved road, the roadbed turns wet and spongy because water is trapped between the pavement and the remaining ice layer beneath.  When trucks and heavy equipment travel over a layer of concrete or asphalt that isn’t well supported beneath, lots of permanent cracks can occur.

Seasonal weight restrictions in effect.  Road commissions must strike a balance between “business as usual” and protecting the roads, and most of them employ licensed Professional Engineers (PEs) to make these decisions.  Most usually consult neighboring road agencies, as well.

By law, road agencies can enact weight restrictions on any roads not designed as “all season” roads.  All season roads are much thicker and designed to allow trucking year around.

Seasonal weight restrictions lower axle-loading limits and reduce maximum travel speeds for certain vehicles.  Click here for details about seasonal weight restrictions and their effect on axle loading and speed limits.

Note that some limited classes are exempt from these restrictions after a permit is filed.

For spring weight restriction bulletins from MDOT on the Trunkline System, click here.

For MDOT's information resource for commercial trucking, click here.

Weight Restriction

Alcona Alger Allegan Alpena Antrim Arenac Baraga Barry Bay Benzie Berrien Branch Calhoun Cass Charlevoix Cheboygan Chippewa Clare Clinton Crawford Delta Dickinson Eaton Emmet Genesee Gladwin Gogebic Grand Traverse Gratiot Hillsdale Houghton Huron Ingham Ionia Iosco Iron Isabella Jackson Kalamazoo Kalkaska Kent Keweenaw Lake Lapeer Leelanau Lenawee Livingston Luce Mackinac Macomb Manistee Marquette Mason Mecosta Menominee Midland Missaukee Monroe Montcalm Montmorency Muskegon Newaygo Oakland Oceana Ogemaw Ontonagon Osceola Oscoda Otsego Ottawa Presque Isle Roscommon Saginaw Sanilac Schoolcraft Shiawassee St. Clair St. Joseph Tuscola Van Buren Washtenaw Wayne Wexford
Green - no seasonal restrictions in effect
Red - indicates restrictions are in effect
Grey - restrictions are in effect in part of the county
Yellow - restriction status is unknown
County Name In Effect Roads Last Updated
Alcona Effective 2/23/2018 Online 2/20/2018
Alger No Online 1/22/2018
Allegan Effective 2/20/2018 Online 2/16/2018
Alpena Effective 2/23/2018 Online 2/20/2018
Antrim Partial List 2/19/2018
Arenac Effective 2/19/2018 Online 2/16/2018
Baraga No N/A 7/19/2017
Barry Effective 2/19/2018 Online 2/15/2018
Bay Effective 2/19/2018 Online 2/15/2018
Benzie Effective 2/20/2018 Online 2/19/2018
Berrien Effective 2/19/2018 Online 2/15/2018
Branch Effective 2/19/2018 List 2/15/2018
Calhoun Effective 2/19/2018 Online 2/19/2018
Cass Effective 2/19/2018 Online 2/16/2018
Charlevoix Effective 2/23/2018 Online 2/19/2018
Cheboygan No N/A 4/13/2017
Chippewa No N/A 1/22/2018
Clare Effective 2/19/2018 Online 2/16/2018
Clinton Effective 2/19/2018 Online 2/15/2018
Crawford Effective 2/23/2018 N/A 2/21/2018
Delta No List 1/22/2018
Dickinson No Online 5/8/2017
Eaton Effective 2/19/2018 Online 2/15/2018
Emmet Effective 2/26/2018 Online 2/20/2018
Genesee Effective 2/19/2018 List 2/15/2018
Gladwin Effective 2/19/2018 List 2/19/2018
Grand Traverse Effective 2/21/2018 Online 2/20/2018
Gratiot Effective 2/19/2018 Online 2/16/2018
Hillsdale Effective 2/19/2018 Online 2/15/2018
Houghton No N/A 7/19/2017
Huron Effective 1/26/2018 Online 1/24/2018
Ingham Effective 2/19/2018 Online 2/16/2018
Ionia Effective 2/19/2018 Online 2/16/2018
Iosco Effective 2/20/2018 Online 2/19/2018
Iron No Online 5/12/2017
Isabella Effective 2/19/2018 Online 2/19/2018
Jackson Effective 2/19/2018 Online 2/15/2018
Kalamazoo Effective 2/19/2018 Online 2/16/2018
Kalkaska Effective 2/22/2018 Online 2/20/2018
Kent Effective 2/19/2018 Online 2/14/2018
Keweenaw No List 5/15/2017
Lake Effective 2/26/2018 N/A 2/19/2018
Lapeer Effective 2/19/2018 Online 2/15/2018
Leelanau Effective 2/19/2018 Online 2/19/2018
Lenawee Effective 2/19/2018 Online 2/16/2018
Livingston Effective 2/20/2018 List 2/15/2018
Luce No List 5/15/2017
Mackinac No List 4/24/2017
Macomb Effective 2/26/2018 List 2/20/2018
Manistee Effective 2/19/2018 List 2/19/2018
Marquette No Online 5/16/2017
Mason Effective 2/19/2018 Online 2/16/2018
Mecosta Effective 2/19/2018 List 2/19/2018
Menominee No List 1/22/2018
Midland Effective 2/19/2018 Online 2/16/2018
Missaukee Effective 2/22/2018 Online 2/20/2018
Monroe Effective 2/19/2018 Online 2/15/2018
Montcalm Effective 2/19/2018 Online 2/14/2018
Montmorency Effective 2/23/2018 Online 2/20/2018
Muskegon Effective 2/19/2018 List 2/14/2018
Newaygo Effective 2/19/2018 List 2/14/2018
Oakland Effective 2/26/2018 N/A 2/20/2018
Oceana Effective 2/19/2018 Online 2/15/2018
Ogemaw Effective 2/20/2018 List 2/19/2018
Ontonagon No N/A 5/15/2017
Osceola Effective 2/19/2018 List 2/16/2018
Oscoda No Online 4/12/2017
Otsego Effective 2/23/2018 List 2/21/2018
Ottawa Effective 2/20/2018 N/A 2/16/2018
Presque Isle Effective 2/26/2018 N/A 2/21/2018
Roscommon Effective 2/22/2018 Online 2/19/2018
Saginaw Effective 2/19/2018 N/A 2/15/2018
Sanilac Effective 2/19/2018 N/A 2/15/2018
Shiawassee Effective 2/19/2018 Online 2/14/2018
St. Clair Effective 2/19/2018 N/A 2/15/2018
St. Joseph Effective 2/19/2018 Online 2/15/2018
Tuscola Effective 2/19/2018 Online 2/16/2018
Van Buren Effective 2/19/2018 Online 2/16/2018
Washtenaw Effective 2/19/2018 Online 2/15/2018
Wayne Effective 2/19/2018 List 2/15/2018
Wexford Effective 2/22/2018 Online 2/19/2018

Click here for a list of contact information for county road agencies.