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Oregon Axle Weight Limits

Axle spacings and weight calculator

Max Legal Weight for GVW under 80,000 lbs and Max Permitted Weight for GVW over 80,000 lbs

Vehicle configuration

Maximum Legal Weight Allowed

Maximum Weight Allowed

Common Vehicle Types​

  • 600 pounds per inch of tire width.
  • 20,000 pounds Single Axle.
  • 34,000 pounds Tandem.
  • 80,000 pounds Gross Weight.
  • Solo truck.
  • Truck-tractor and semitrailer.
  • Truck and trailer.
  • Log truck and pole trailer.

Exemptions and weight table. See https://www.oregon.gov/ODOT/Forms/Motcarr/8110.pdf

Maximum Permit Weight Allowed

Extended Weight, Permit Required:

Use for trucks with legal axle weights hauling divisible loads.

Maximum Weight Allowed:

  • Between 80,000 pounds and 105,500 pounds.

Common vehicle types:

  • Truck-tractor-semitrailer-trailer (aka doubles).
  • Triple-trailer combinations.
  • Truck-tractor.
  • Tri-axle semitrailers.

Exemptions:

  • An additional 550 pounds above the weights shown above is allowed for fully functional idle reduction systems.
  • An addional 2000 pounds above the weights shown above is allowed for a vehicle that uses natural gas as its fuel source.

Heavy Haul Weight, Permit Required

Use for trucks with heavy haul / non-legal axle weights hauling a non-divisible load.

Maximum Weight Allowed

Common Vehicle Types​

  • Single Trip Permit is based on the number of axles and wheelbase.
  • Annual Continuous Operation Permits allows up to 98,000 pounds for non-divisible loads.
  • 600 pounds per inch of tire width.
  • 21,500 pounds per single axle.
  • 43,000 pounds per tandem axle, the weight shown on the over-dimension permit and the sum of the permittable axle, tandem axle, or group axle weight, whichever is less.
  • Truck-tractor-lowbed semitrailer.
  • Truck-tractor-semitrailer and booster.

See tables https://www.oregon.gov/ODOT/Forms/Motcarr/8112.pdf, https://www.oregon.gov/ODOT/Forms/Motcarr/8113.pdf and https://www.oregon.gov/ODOT/Forms/Motcarr/8114.pdf

  • Up to 48,000 pounds per tandem axle may be allowed if the combination of vehicles has at least 9 axle with a steer axle followed by four consecutive tandem axles which are 8 foot wide (standard).
  • Up to 52,800 pounds may be allowed when the combination has 10 foot wide axles with 4 tires per axle.
  • Up to 60,000 pounds may be allowed when the combination has 10 foot wide axles with 8 tires per axle.

(for Truck-tractor with jeep, semitrailer and booster)

Common Uses for Single-Trip Permits

  • Movement of an excavator on a truck-tractor/semitrailer combination, with booster axle behind the semitrailer, to distribute the weight. The gross weight is 140,000 pounds.
  • Movement of trusses. The trusses are 90 feet in length.
  • Movement of a piece of logging equipment. The height on the trailer is 16 feet 00 inches.

Common Uses for Annual Permits

  • Extended Weight, allowing up to 105,500 pounds gross weight, when hauling a divisible load.
  • Overwidth, when hauling a single, non-divisible load.
  • Excessive rear overhang, when hauling a single, non-divisible load on a truck-tractor / semitrailer combination.

Source of information: https://www.oregon.gov/ODOT/MCT/Pages/Over-Dimension.aspx
Online Weight Calculator: https://www.oregontruckingonline.com/cf/MCAD/pubMetaEntry/ODPermits/weightAnalysis/