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 Until 5/4/2018 Online 5/1/2018
Alger Until 5/21/2018 Online 5/16/2018
Allegan Until 3/26/2018 Online 3/22/2018
Alpena Until 5/7/2018 Online 5/2/2018
Antrim No Online 5/4/2018
Arenac Until 4/27/2018 Online 4/23/2018
Baraga Partial N/A 5/22/2018
Barry Until 3/28/2018 Online 3/27/2018
Bay Until 4/27/2018 Online 4/24/2018
Benzie Until 4/30/2018 Online 4/27/2018
Berrien Until 3/23/2018 Online 3/20/2018
Branch Until 3/26/2018 List 3/22/2018
Calhoun Until 3/28/2018 Online 4/2/2018
Cass Until 3/26/2018 Online 3/26/2018
Cheboygan Until 5/4/2018 N/A 5/1/2018
Chippewa Partial N/A 5/9/2018
Clare No Online 4/17/2018
Clinton Until 3/28/2018 Online 3/26/2018
Crawford Until 5/7/2018 N/A 5/3/2018
Delta Until 5/16/2018 List 5/15/2018
Dickinson No Online 5/23/2018
Eaton No Online 4/6/2018
Emmet Until 4/30/2018 Online 4/25/2018
Genesee No N/A 4/12/2018
Gladwin No List 4/27/2018
Gogebic Partial Online 5/22/2018
Grand Traverse Until 4/30/2018 Online 4/27/2018
Gratiot Until 3/28/2018 Online 3/26/2018
Hillsdale Until 4/1/2018 Online 3/29/2018
Houghton Partial Online 5/21/2018
Huron Until 4/10/2018 Online 4/10/2018
Ingham No Online 4/2/2018
Ionia Until 3/28/2018 Online 3/28/2018
Iosco Until 4/30/2018 Online 4/26/2018
Iron Partial List 5/22/2018
Isabella Until 4/23/2018 Online 4/17/2018
Jackson Until 4/2/2018 Online 4/5/2018
Kalamazoo Until 3/26/2018 Online 3/22/2018
Kalkaska No Online 5/7/2018
Kent Until 3/28/2018 Online 3/28/2018
Keweenaw No Online 5/23/2018
Lake Until 4/18/2018 N/A 4/17/2018
Lapeer No Online 4/12/2018
Leelanau No List 5/7/2018
Lenawee Until 4/2/2018 Online 3/29/2018
Livingston Until 4/13/2018 N/A 4/12/2018
Luce Partial List 5/22/2018
Mackinac Until 5/16/2018 List 5/14/2018
Macomb Until 4/2/2018 List 3/23/2018
Manistee Until 4/30/2018 List 4/25/2018
Marquette Partial Online 5/22/2018
Mason Until 4/23/2018 Online 4/20/2018
Mecosta Until 4/18/2018 List 4/12/2018
Menominee Until 5/10/2018 N/A 5/9/2018
Midland Until 4/30/2018 Online 4/25/2018
Missaukee Until 4/26/2018 Online 4/25/2018
Monroe Until 4/2/2018 Online 3/27/2018
Montcalm Until 3/28/2018 Online 3/22/2018
Montmorency Until 5/3/2018 Online 5/2/2018
Muskegon Until 3/28/2018 List 3/22/2018
Newaygo Until 3/28/2018 List 3/23/2018
Oakland Until 4/2/2018 N/A 3/23/2018
Oceana Until 4/18/2018 Online 4/11/2018
Ogemaw Until 4/30/2018 List 4/26/2018
Ontonagon No Online 5/23/2018
Osceola No List 4/25/2018
Oscoda Until 5/4/2018 Online 5/2/2018
Otsego Until 5/4/2018 List 5/2/2018
Ottawa Until 3/26/2018 N/A 3/22/2018
Presque Isle Until 5/4/2018 N/A 5/2/2018
Roscommon Until 5/4/2018 Online 4/30/2018
Saginaw Until 4/16/2018 N/A 4/10/2018
Sanilac Until 4/11/2018 N/A 4/10/2018
Shiawassee Until 3/28/2018 Online 3/26/2018
St. Clair No N/A 4/10/2018
St. Joseph No N/A 3/26/2018
Tuscola Until 4/17/2018 Online 4/16/2018
Van Buren Until 3/19/2018 Online 3/16/2018
Washtenaw Until 4/2/2018 Online 3/29/2018
Wayne Until 4/2/2018 List 3/27/2018
Wexford Until 5/1/2018 Online 4/30/2018

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