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 2/17/2017 Online 2/15/2017
Alger Effective 2/18/2017 Online 2/16/2017
Allegan Until 3/13/2017 Online 3/8/2017
Alpena Effective 2/18/2017 Online 2/17/2017
Antrim Effective 2/18/2017 Online 2/14/2017
Arenac Effective 2/17/2017 Online 2/14/2017
Baraga Effective 2/17/2017 N/A 2/14/2017
Barry Until 3/27/2017 Online 3/20/2017
Bay Effective 2/17/2017 Online 2/13/2017
Benzie Effective 2/17/2017 Online 2/14/2017
Berrien No Online 2/21/2017
Branch Until 3/13/2017 List 3/8/2017
Calhoun Until 3/13/2017 Online 3/6/2017
Cass No N/A 1/1/2016
Charlevoix Effective 2/18/2017 Online 2/14/2017
Cheboygan Effective 2/20/2017 N/A 2/14/2017
Chippewa Effective 2/21/2017 N/A 2/21/2017
Clare Effective 2/17/2017 Online 3/6/2017
Clinton Until 3/27/2017 Online 3/22/2017
Crawford Effective 2/17/2017 N/A 2/14/2017
Delta Effective 2/17/2017 List 2/15/2017
Dickinson Effective 2/18/2017 List 2/16/2017
Eaton Until 3/27/2017 Online 3/22/2017
Emmet Effective 2/20/2017 List 2/21/2017
Genesee Until 3/24/2017 List 3/23/2017
Gladwin Effective 2/17/2017 List 2/14/2017
Gogebic Effective 2/17/2017 Online 2/15/2017
Grand Traverse Effective 2/17/2017 Online 2/13/2017
Gratiot Until 3/29/2017 Online 3/23/2017
Hillsdale No Online 3/6/2017
Houghton Effective 2/17/2017 N/A 2/14/2017
Huron Effective 1/21/2017 Online 1/18/2017
Ingham No Online 3/10/2017
Ionia Until 3/27/2017 Online 3/21/2017
Iosco Effective 2/17/2017 Online 2/14/2017
Iron Effective 2/17/2017 Online 2/16/2017
Isabella Effective 2/17/2017 Online 2/13/2017
Jackson Until 3/13/2017 Online 3/6/2017
Kalamazoo Until 2/27/2017 Online 2/24/2017
Kalkaska Effective 2/17/2017 Online 3/7/2017
Kent Until 3/27/2017 Online 3/21/2017
Keweenaw Effective 2/17/2017 List 2/15/2017
Lake Until 4/3/2017 N/A 3/23/2017
Lapeer Effective 2/13/2017 Online 2/9/2017
Leelanau Effective 2/17/2017 Online 2/14/2017
Lenawee Until 3/13/2017 Online 3/9/2017
Livingston No N/A 3/21/2017
Luce Effective 2/21/2017 List 2/23/2017
Mackinac Effective 2/20/2017 List 2/15/2017
Macomb Until 3/13/2017 List 3/7/2017
Manistee Effective 2/17/2017 List 2/14/2017
Marquette Effective 3/5/2017 Online 3/1/2017
Mason Until 4/3/2017 Online 3/23/2017
Mecosta Effective 2/17/2017 Online 2/14/2017
Menominee Effective 2/17/2017 List 2/14/2017
Midland Effective 2/17/2017 N/A 2/14/2017
Missaukee Effective 2/17/2017 Online 2/14/2017
Monroe Until 3/6/2017 List 3/1/2017
Montcalm Until 3/27/2017 Online 3/24/2017
Montmorency Effective 2/18/2017 List 2/15/2017
Muskegon Until 3/13/2017 N/A 3/8/2017
Newaygo Until 3/27/2017 List 3/21/2017
Oakland Until 3/13/2017 N/A 3/7/2017
Oceana Effective 2/14/2017 Online 2/13/2017
Ogemaw Effective 2/17/2017 List 2/14/2017
Ontonagon Effective 2/17/2017 N/A 2/15/2017
Osceola Effective 2/17/2017 List 2/20/2017
Oscoda Effective 2/18/2017 List 2/14/2017
Otsego Effective 2/18/2017 List 2/15/2017
Ottawa Until 3/13/2017 N/A 3/7/2017
Presque Isle Effective 2/18/2017 N/A 2/15/2017
Roscommon Effective 2/17/2017 Online 2/14/2017
Saginaw Effective 1/20/2017 N/A 1/18/2017
Sanilac Until 3/27/2017 N/A 3/22/2017
Schoolcraft Effective 2/17/2017 List 2/27/2017
Shiawassee Effective 2/10/2017 Online 3/22/2017
St. Clair Effective 3/27/2017 N/A 3/22/2017
St. Joseph No Online 3/14/2017
Tuscola Until 3/27/2017 List 3/24/2017
Van Buren Until 3/6/2017 Online 2/24/2017
Washtenaw Until 3/13/2017 Online 3/8/2017
Wayne No N/A 1/1/2016
Wexford Effective 2/17/2017 Online 2/14/2017