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
AlconaEffective 03/14/19Uploaded03/13/19
AlgerEffective 03/20/19None03/13/19
AlleganNoneNone04/11/19
AlpenaEffective 03/07/19None03/15/19
AntrimEffective 03/14/19Online03/12/19
ArenacUntil 04/22/19Online04/17/19
BaragaEffective 03/14/19None03/09/19
BarryUntil 04/10/19None04/08/19
BayUntil 04/22/19Online04/16/19
BenzieEffective 03/13/19Online03/11/19
BerrienUntil 04/01/19Online03/28/19
BranchNoneNone04/01/19
CalhounUntil 04/08/19Online04/02/19
CassNoneNone04/01/19
CharlevoixEffective 03/14/19None03/11/19
CheboyganEffective 03/14/19Online03/15/19
ChippewaEffective 03/20/19Uploaded03/22/19
ClareUntil 04/17/19Online04/12/19
ClintonUntil 04/08/19None04/04/19
CrawfordEffective 03/14/19None03/11/19
DeltaEffective 03/18/19Uploaded03/13/19
DickinsonEffective 03/18/19Online03/14/19
EatonUntil 04/08/19Online04/04/19
EmmetEffective 03/14/19None03/11/19
GeneseeUntil 04/08/19Online04/01/19
GladwinUntil 04/22/19Uploaded04/18/19
GogebicEffective 03/18/19Uploaded03/11/19
Grand TraverseUntil 04/22/19Online04/18/19
GratiotUntil 04/11/19Online04/05/19
HillsdaleUntil 04/08/19None04/05/19
HoughtonEffective 03/14/19None03/09/19
HuronUntil 04/22/19Online04/16/19
InghamUntil 04/08/19None04/08/19
IoniaUntil 04/10/19Online04/05/19
IoscoEffective 03/13/19None03/11/19
IronEffective 03/20/19Online03/26/19
IsabellaUntil 04/22/19None04/16/19
JacksonUntil 04/08/19None04/08/19
KalamazooUntil 04/08/19None04/04/19
KalkaskaEffective 03/13/19Uploaded03/11/19
KentUntil 04/10/19None04/08/19
KeweenawEffective 03/14/19None03/15/19
LakeUntil 04/22/19None04/17/19
LapeerNoneNone04/15/19
LeelanauEffective 03/13/19Uploaded04/03/19
LenaweeUntil 04/08/19Online04/04/19
LivingstonUntil 04/18/19Online04/16/19
LuceEffective 03/20/19Uploaded03/18/19
MackinacEffective 03/18/19Uploaded03/12/19
MacombUntil 04/11/19Uploaded04/08/19
ManisteeEffective 03/15/19None03/08/19
MarquetteEffective 03/20/19Online03/12/19
MasonUntil 04/22/19Online04/16/19
MecostaUntil 04/15/19None04/11/19
MenomineeEffective 03/14/19None03/12/19
MidlandUntil 04/22/19None04/18/19
MissaukeeEffective 03/13/19None03/11/19
MonroeUntil 04/08/19Online04/03/19
MontcalmUntil 04/10/19Online04/04/19
MontmorencyEffective 03/18/19None03/11/19
MuskegonUntil 04/08/19Uploaded04/03/19
NewaygoUntil 04/22/19Online04/16/19
OaklandUntil 04/08/19Online04/04/19
OceanaUntil 04/22/19Online04/17/19
OgemawEffective 03/13/19Uploaded03/11/19
OntonagonEffective 03/14/19None03/18/19
OsceolaUntil 04/22/19Uploaded04/16/19
OscodaEffective 03/18/19Uploaded03/15/19
OtsegoEffective 03/14/19Uploaded03/14/19
OttawaUntil 04/08/19Online04/03/19
Presque IsleEffective 03/18/19Online03/26/19
RoscommonEffective 03/14/19Online03/13/19
SaginawUntil 04/15/19None04/08/19
SanilacUntil 04/15/19None04/11/19
SchoolcraftEffective 03/13/19Uploaded03/11/19
ShiawasseeUntil 04/08/19Online04/05/19
St. ClairNoneNone04/11/19
St. JosephUntil 04/01/19Uploaded03/26/19
TuscolaUntil 04/15/19Online04/15/19
Van BurenUntil 04/01/19Online03/28/19
WashtenawUntil 04/08/19Online04/05/19
WayneUntil 04/08/19Online04/04/19
WexfordEffective 03/13/19Online03/11/19

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