What it is
This permit specifically applies to bulk raw milk transport and is recognized as a non-divisible load under federal and Washington law—meaning the load cannot be reduced to meet standard limits.
It is designed for operations moving milk:
- From farms
- To processing plants
- To receiving or transfer stations
What it allows
With this annual permit, carriers can operate:
- Double trailer combinations
- Up to 85 feet total length
- Up to 129,000 lbs gross weight
This significantly exceeds normal legal limits, making the permit essential for milk haulers.
Cost
- Annual Permit Fee: approximately $800 per year
No monthly version is typically offered for this specific milk double trailer permit—only annual.
Who needs it
This permit is required for:
- Dairy transport companies
- Milk haulers operating double trailers
- Farms or contractors moving bulk raw milk
Key rules & restrictions
Even with the permit, carriers must follow:
- Legal axle weight limits still apply
- Maximum length cannot exceed 85 ft
- Must follow all WSDOT route restrictions
- Travel allowed without holiday/commuter curfews (special exemption)
Important notes
- Only valid for raw liquid milk hauling
- Cannot be used for general freight or other liquids
- Must operate within designated approved routes and highways