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 TraverseGratiotHillsdaleHoughtonHuronInghamIoniaIoscoIronIsabellaJacksonKalamazooKalkaskaKentKeweenawLakeLapeerLeelanauLenaweeLivingstonLuceMackinacMacombManisteeMarquetteMasonMecostaMenomineeMidlandMidlandMissaukeeMonroeMontcalmMontmorencyMuskegonNewaygoOaklandOceanaOgemawOntonagonOsceolaOscodaOtsegoOttawaPresque IsleRoscommonSaginawSanilacSchoolcraftShiawasseeSt. ClairSt. JosephTuscolaVan BurenWashtenawWayneWexford
County NameIn EffectRoadsLast Updated
AlconaEffective 03/14/19Uploaded03/13/19
AlgerEffective 03/20/19None03/13/19
AlleganEffective 03/11/19Online03/05/19
AlpenaEffective 03/07/19None03/15/19
AntrimEffective 03/14/19Online03/12/19
ArenacEffective 03/13/19Online03/11/19
BaragaEffective 03/14/19None03/09/19
BarryEffective 03/08/19None03/06/19
BayEffective 03/13/19Online03/13/19
BenzieEffective 03/13/19Online03/11/19
BerrienEffective 03/11/19Online03/05/19
BranchEffective 03/11/19Online03/06/19
CalhounEffective 03/09/19Online03/11/19
CassEffective 03/11/19Online03/07/19
CharlevoixEffective 03/14/19None03/11/19
CheboyganEffective 03/14/19Online03/15/19
ChippewaEffective 03/20/19Uploaded03/22/19
ClareEffective 03/12/19Online03/07/19
ClintonEffective 03/11/19None03/05/19
CrawfordEffective 03/14/19None03/11/19
DeltaEffective 03/18/19Uploaded03/13/19
DickinsonEffective 03/18/19Online03/14/19
EatonEffective 03/11/19Online03/05/19
EmmetEffective 03/14/19None03/11/19
GeneseeEffective 03/13/19Online03/07/19
GladwinEffective 03/11/19Uploaded03/11/19
GogebicEffective 03/18/19Uploaded03/11/19
Grand TraverseEffective 03/13/19Online03/11/19
GratiotEffective 03/11/19Online03/06/19
HillsdaleEffective 03/11/19None03/11/19
HoughtonEffective 03/14/19None03/09/19
HuronEffective 03/09/19Online03/05/19
InghamEffective 03/08/19None03/06/19
IoniaEffective 03/08/19Online03/26/19
IoscoEffective 03/13/19None03/11/19
IronEffective 03/20/19Online03/26/19
IsabellaEffective 03/11/19None03/06/19
JacksonEffective 03/11/19None03/05/19
KalamazooEffective 03/11/19None03/05/19
KalkaskaEffective 03/13/19Uploaded03/11/19
KentEffective 03/08/19None03/08/19
KeweenawEffective 03/14/19None03/15/19
LakeEffective 03/13/19None03/13/19
LapeerEffective 03/13/19Online03/08/19
LeelanauEffective 03/13/19Uploaded03/11/19
LenaweeEffective 03/08/19Online03/05/19
LivingstonEffective 03/01/19Online02/26/19
LuceEffective 03/20/19Uploaded03/18/19
MackinacEffective 03/18/19Uploaded03/12/19
MacombEffective 03/14/19Uploaded03/07/19
ManisteeEffective 03/15/19None03/08/19
MarquetteEffective 03/20/19Online03/12/19
MasonEffective 03/13/19Online03/08/19
MecostaEffective 03/13/19None03/11/19
MenomineeEffective 03/14/19None03/12/19
MidlandEffective 03/12/19None03/06/19
MidlandEffective 03/12/19None03/13/19
MissaukeeEffective 03/13/19None03/11/19
MonroeEffective 03/09/19Online03/06/19
MontcalmEffective 03/08/19Online03/08/19
MontmorencyEffective 03/18/19None03/11/19
MuskegonEffective 03/08/19Uploaded03/06/19
NewaygoEffective 03/11/19Online03/26/19
OaklandEffective 03/14/19Online03/08/19
OceanaEffective 03/08/19Online03/06/19
OgemawEffective 03/13/19Uploaded03/11/19
OntonagonEffective 03/14/19None03/18/19
OsceolaEffective 03/13/19Uploaded03/08/19
OscodaEffective 03/18/19Uploaded03/15/19
OtsegoEffective 03/14/19Uploaded03/14/19
OttawaEffective 03/11/19Online03/05/19
Presque IsleEffective 03/18/19Online03/26/19
RoscommonEffective 03/14/19Online03/13/19
SaginawEffective 03/13/19None03/04/19
SanilacEffective 03/11/19None03/07/19
SchoolcraftEffective 03/13/19Uploaded03/11/19
ShiawasseeEffective 03/11/19None03/05/19
St. ClairEffective 03/14/19None03/07/19
St. JosephUntil 04/01/19Uploaded03/26/19
TuscolaEffective 03/11/19Online03/07/19
Van BurenEffective 03/11/19Online03/05/19
WashtenawEffective 03/08/19Online03/07/19
WayneEffective 03/11/19Online03/06/19
WexfordEffective 03/13/19Online03/11/19

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