Wisconsin and Minnesota Oversize Load Permits: What Heavy Equipment Shippers Need to Know
Wisconsin and Minnesota are two of the most active heavy-haul states in the Upper Midwest, with significant construction, agricultural, and industrial equipment moving through both states year-round. Each state maintains its own oversize/overweight (OSOW) permitting system with distinct rules for pilot cars, travel windows, and holiday restrictions — and there is no reciprocity between them. This guide breaks down what you need to know before moving an oversize load through either state.
Legal Size and Weight Limits
Both Wisconsin and Minnesota follow federal baseline limits as the starting point for permit requirements, but each state has specific thresholds that trigger additional requirements:
| Dimension | Federal Baseline | Wisconsin Legal Limit | Minnesota Legal Limit |
|---|---|---|---|
| Width | 8'6" | 8'6" | 8'6" |
| Height | 13'6" | 13'6" | 13'6" |
| Length (trailer) | 53' | 53' (65' combo) | 53' (75' combo with permit) |
| Gross Weight | 80,000 lbs | 80,000 lbs | 80,000 lbs |
Any load exceeding these limits requires a state-issued oversize or overweight permit before travel begins. Permits are not transferable between states — a Wisconsin permit does not authorize travel in Minnesota, and vice versa.
Wisconsin Oversize Load Requirements (WisDOT)
Pilot Car (Escort) Requirements
- Width over 15': One escort vehicle required
- Width over 18': Police escort required
- Width over 20': Two escort vehicles required
- Height over 16': Height pole escort required
Travel Restrictions
- Loads over 12' wide, 13'6" tall, or 150' long: Daylight-only travel (30 minutes before sunrise to 30 minutes after sunset)
- Weekend and holiday travel restrictions apply to loads in these categories
- Overweight-only loads (within legal dimensions) may generally travel 24 hours per day
Route Survey Requirements
A route survey is mandatory for any load exceeding 16 ft in height or 16 ft in width. The survey verifies bridge clearances, overhead utility conflicts, and road suitability for the specific load dimensions.
Signage
"Oversize Load" signs are required for vehicles over 10 ft wide or exceeding legal length. Signs must be visible from both front and rear of the load.
Minnesota Oversize Load Requirements (MnDOT)
Pilot Car Requirements
Minnesota requires certified pilot escorts for loads exceeding specific thresholds. Minnesota accepts pilot car certifications from Colorado, Florida, and Utah, provided all local requirements are met. Pilot car operators must carry their certification documentation during the move.
Travel Restrictions
- Holiday blackouts (loads over 12'6" wide or 110' long): No travel from 2:00 PM the day before a holiday until 2:00 AM the day after
- Summer weekend restrictions (Memorial Day through Labor Day): Loads over 12'6" wide or 110' long prohibited from traveling 4:00–8:00 PM on Fridays and Sundays
- Twin Cities and Duluth metro rush hours: Loads over 14'6" wide or 110' long restricted 6:00–8:30 AM and 3:30–6:00 PM on weekdays
Warning Devices
- Red or orange flags (18-inch square) required at widest points for loads over 9' wide or 75' long
- "Oversize Load" signs required for loads over 12'6" wide or 95' long
Spring Weight Restrictions
Both Wisconsin and Minnesota impose spring road restrictions (typically March through May) to protect road surfaces during the freeze-thaw cycle. During this period:
- Weight limits on secondary roads are reduced — sometimes to 5 tons per axle
- Heavy equipment moves should be routed on Interstate highways and other designated unrestricted routes
- Carriers must verify current restriction status with WisDOT and MnDOT before booking spring moves
- Spring restrictions can significantly impact transit times and routing options
Permit Application Process
Both states offer online permit applications:
- Wisconsin: WisDOT's online permit system (OSP) handles most standard oversize permits. Complex loads may require manual review.
- Minnesota: MnDOT's online permit system handles single-trip and annual permits. Loads requiring engineering review may take 5–10 business days.
Permit fees for standard oversize loads typically range from $15 to $150 per state. Complex loads requiring engineering review or route surveys may incur additional fees.
Planning Your Move Through Wisconsin and Minnesota
Key planning considerations for oversize loads through these states:
- Apply for permits at least 5–7 business days before the planned move date
- Verify holiday and weekend travel restrictions before scheduling — a load that can't travel on a Friday afternoon may need to be staged overnight
- Confirm spring restriction status if moving between March and May
- Ensure pilot car operators are certified and carry documentation
- Plan Twin Cities metro routing to avoid rush-hour restrictions for wide loads
IronHaul Logistics handles all permit coordination, escort scheduling, and route planning for oversize loads through Wisconsin and Minnesota. Call (208) 495-2260, email [email protected], or submit a quote request online to get started.
Common questions
Do I need separate permits for Wisconsin and Minnesota?
Yes. There is no reciprocity between Wisconsin and Minnesota OSOW permits. You must obtain separate permits from WisDOT and MnDOT for the portions of the trip within each state.
What are the holiday travel restrictions in Minnesota for oversize loads?
Loads over 12'6" wide or 110' long are prohibited from traveling from 2:00 PM the day before a holiday until 2:00 AM the day after. Summer weekend restrictions also apply between Memorial Day and Labor Day.
When do spring weight restrictions apply in Wisconsin and Minnesota?
Spring restrictions typically run from March through May, though exact dates vary by year and road conditions. During this period, weight limits on secondary roads are significantly reduced. Heavy equipment should be routed on Interstate highways.
What width triggers a pilot car requirement in Wisconsin?
Wisconsin requires one escort vehicle for loads over 15 ft wide, police escort for loads over 18 ft wide, and two escort vehicles for loads over 20 ft wide.
How far in advance should I apply for oversize permits in these states?
Apply at least 5–7 business days before the planned move. Complex loads requiring engineering review or route surveys may need 10–14 business days. IronHaul handles all permit applications as part of the transport quote.
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