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.


 

  • 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
AlconaAlgerAlleganAlpenaAntrimArenacBaragaBarryBayBenzieBerrienBranchCalhounCassCharlevoixCheboyganChippewaClareClintonCrawfordDeltaDickinsonEatonEmmetGeneseeGladwinGogebicGrand TraverseGratiotHillsdaleHoughtonHuronInghamIoniaIoscoIronIsabellaJacksonKalamazooKalkaskaKentKeweenawLakeLapeerLeelanauLenaweeLivingstonLuceMackinacMacombManisteeMarquetteMasonMecostaMenomineeMidlandMissaukeeMonroeMontcalmMontmorencyMuskegonNewaygoOaklandOceanaOgemawOntonagonOsceolaOscodaOtsegoOttawaPresque IsleRoscommonSaginawSanilacSchoolcraftShiawasseeSt. ClairSt. JosephTuscolaVan BurenWashtenawWayneWexford
County NameIn EffectRoadsLast Updated
AlconaUntil 04/09/20Online04/06/20
AlgerUntil 05/14/20None05/07/20
AlleganUntil 03/16/20Online03/12/20
AlpenaUntil 04/13/20None04/13/20
AntrimNoneNone04/16/20
ArenacUntil 03/27/20Online03/19/20
BaragaNoneNone05/29/20
BarryUntil 03/19/20None03/19/20
BayUntil 03/27/20Online03/19/20
BenzieUntil 04/06/20Online04/02/20
BerrienNoneNone02/20/20
BranchNoneNone04/01/19
CalhounNoneNone02/20/20
CassNoneNone04/01/19
CharlevoixNoneNone04/24/20
CheboyganUntil 04/08/20None04/03/20
ChippewaUntil 05/06/20Uploaded05/05/20
ClareUntil 03/26/20Online03/23/20
ClintonNoneNone03/19/20
CrawfordUntil 04/09/20None04/07/20
DeltaUntil 05/15/20Uploaded05/11/20
DickinsonNoneNone05/22/20
EatonNoneNone03/23/20
EmmetUntil 04/06/20None03/31/20
GeneseeUntil 03/19/20Online03/13/20
GladwinNoneNone03/26/20
GogebicUntil 05/13/20Uploaded06/16/20
Grand TraverseUntil 03/30/20Online03/26/20
GratiotUntil 03/19/20Online03/17/20
HillsdaleNoneNone03/16/20
HoughtonUntil 05/13/20None05/11/20
HuronUntil 03/23/20Online03/18/20
InghamUntil 03/19/20Online03/18/20
IoniaUntil 03/19/20Online03/12/20
IoscoNoneNone04/01/20
IronUntil 06/03/20Online06/03/20
IsabellaUntil 03/23/20None03/20/20
JacksonNoneNone03/19/20
KalamazooUntil 03/23/20None08/13/20
KalkaskaUntil 04/15/20Online04/16/20
KentUntil 03/19/20Online03/12/20
KeweenawUntil 05/13/20None05/11/20
LakeNoneNone03/23/20
LapeerNoneNone03/19/20
LeelanauUntil 04/03/20Uploaded04/07/20
LenaweeNoneNone02/20/20
LivingstonNoneNone03/25/20
LuceUntil 05/27/20Uploaded05/26/20
MackinacNoneNone04/27/20
MacombNoneNone02/20/20
ManisteeUntil 04/06/20None03/31/20
MarquetteNoneNone05/27/20
MasonUntil 03/30/20Online03/31/20
MecostaUntil 03/25/20Uploaded03/23/20
MenomineeUntil 05/15/20None05/11/20
MidlandUntil 03/26/20Online03/25/20
MissaukeeUntil 04/01/20Online03/30/20
MonroeNoneNone02/20/20
MontcalmUntil 03/19/20Online03/12/20
MontmorencyUntil 04/09/20None04/07/20
MuskegonUntil 03/16/20Uploaded03/11/20
NewaygoUntil 03/23/20Online03/19/20
OaklandNoneNone02/20/20
OceanaUntil 03/23/20None03/23/20
OgemawUntil 04/01/20Uploaded03/26/20
OntonagonUntil 05/13/20None05/11/20
OsceolaNoneNone03/26/20
OscodaNoneNone04/13/20
OtsegoUntil 04/08/20Uploaded04/03/20
OttawaNoneNone03/16/20
Presque IsleNoneNone04/13/20
RoscommonUntil 04/08/20Online04/06/20
SaginawUntil 03/23/20None03/13/20
SanilacNoneNone02/20/20
SchoolcraftNoneNone08/11/20
ShiawasseeUntil 03/19/20Online03/16/20
St. ClairNoneNone08/24/20
St. JosephNoneNone08/24/20
TuscolaUntil 03/30/20Online03/20/20
Van BurenNoneNone02/20/20
WashtenawNoneNone03/16/20
WayneNoneNone02/04/20
WexfordUntil 04/06/20Online03/31/20

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