Alaska Oversize Permits: Fees, Escorts, and Dalton Highway Rules

If your truck or load is wider than 102 inches, taller than 15 feet, longer than the limits for your configuration, or heavier than Alaska’s axle and bridge-formula caps, you need an Alaska oversize permit from the Department of Transportation and Public Facilities before you move on any state highway. The same permit system handles overweight loads, and most hauls that exceed one limit end up exceeding another, so the application, fees, and conditions all run through one office.

When You Need a Permit

Alaska’s legal size limits are set in 17 AAC 25.012. A permit is required anytime a vehicle or load crosses one of these thresholds:¹

Width over 102 inches, including the load.
Height over 15 feet on most state highways, or over 17 feet between the Fox Weigh Station and Prudhoe Bay on the Dalton and Elliott Highways.
A semitrailer cargo-carrying length over 53 feet on National Highway System routes, or any combination over 75 feet on non-NHS state highways. A truck tractor pulling a single trailer has no overall length limit on NHS routes.
A load that extends more than three feet past the front bumper or more than four feet past the rear of the vehicle.

Attached safety items like mirrors and turn signal lamps don’t count toward the width measurement.

Weight Limits and the Bridge Formula

Legal axle weights under 17 AAC 25.013 are 20,000 pounds on a single axle (with at least 8 feet 1 inch of spacing from the next axle), 38,000 pounds on a tandem, 42,000 on a tridem, and 50,000 on a four-axle group. Any axle closer than 8 feet 1 inch to another is treated as part of a group rather than as a standalone axle.²

Clearing those numbers doesn’t make you legal on its own. Alaska also applies the Bridge Gross Weight Formula, W = 500 × [(L × N / (N − 1)) + 12N + 36], where W is the maximum allowed gross weight rounded to the nearest 500 pounds, L is the distance in feet between the outermost axles, and N is the number of axles. The formula applies to the whole vehicle and to interior axle groupings such as the tractor bridge and trailer bridge. A load that satisfies every per-axle limit can still fail the bridge formula if the weight is bunched too tightly for the axle spacing. Vehicles without lift axles in the drive axle group get an additional 3,000-pound allowance.²³

Single-Trip or Extended-Period

ADOT&PF issues two main permit types. Pick the one that matches your haul.

A single-trip permit covers one movement of a non-divisible load between a named origin and destination. Non-divisible means the load can’t be broken into smaller pieces without losing its value or intended use; if your cargo could legally be split between two trucks, it won’t qualify for an overweight single-trip permit. The approved permit names an exact route and gives you a few days to complete the move so weather or mechanical delays don’t void it.⁴

An extended-period permit lets a carrier that regularly hauls slightly oversize or overweight loads skip the per-trip application. Durations are one month, up to three months, up to six, up to nine, and up to twelve. The tradeoff is tighter dimension caps. ADOT&PF won’t issue an extended-period permit for loads wider than 10 feet 6 inches, taller than 15 feet (17 feet on the Dalton and Elliott Highways), over legal length, with overhangs beyond 10 feet, or over 125 percent of the legal axle or gross weight. Anything beyond those limits has to run on a single-trip permit.⁴

What the Permits Cost

Single-move fees start at a $40 base for oversize only or overweight only, or $70 if the load is both. Width surcharges add $25 for widths between 10 and 16 feet or $35 above 16 feet, and height surcharges follow a similar pattern starting at 16 feet. An overweight surcharge of $25 applies at 150,000 pounds and up. The total is the base plus every applicable surcharge.⁵

Extended-period fees for a permit covering either oversize or overweight run $85 for a month, $220 for up to three months, $330 for up to six, $495 for up to nine, and $550 for a full twelve. If the permit covers both oversize and overweight, those figures roughly double, topping out at $1,100 for a year.⁵

How to Apply

Applications go through ADOT&PF’s online system at AKSWOOP.com. First-time users have to set up an account before they can file.⁶

You’ll be asked for carrier information (company, contact, USDOT number), vehicle information (VIN, plate, axle count and spacing, weight distribution), and load information (commodity, dimensions, total weight). You also need to plan and submit the full route by highway and milepost so ADOT&PF can check the bridges and structures along the way. For any overweight permit, or any load over 14 feet wide, 16 feet 6 inches tall, or 150 feet long, the specific route is written onto the permit itself. Pilot and escort vehicles have to carry commercial vehicle insurance.⁷

When You Can and Can’t Travel

A permit doesn’t let you roll whenever you like. The specific windows show up on the face of each permit, but the general rules work like this.

Oversize loads travel in daylight unless the permit specifically authorizes night movement with proper lighting and retroreflective tape. Weekend movement is prohibited after noon on Saturday and all day Sunday. Anchorage, Fairbanks, Juneau, the Kenai/Soldotna corridor, Ketchikan, and Palmer/Wasilla all add peak-traffic blackout periods inside city limits.⁷

Memorial Day, Independence Day, and Labor Day each trigger an 84-hour blackout. It starts at noon on the Thursday or Friday before the holiday depending on how the dates fall, which puts three and a half days off the schedule for every one of those holidays.⁷

Signs, Flags, Lights, and Escorts

Any load wider than 10 feet 6 inches has to run with at least one pilot or escort vehicle, and the exact number scales up with the load. The permit specifies how many escorts you need and where they belong in the formation.⁷

Signs reading “OVERSIZE,” “OVERSIZE LOAD,” “WIDE LOAD,” or “LONG LOAD” are required on the front and rear of the cargo-carrying vehicle. Each sign is at least 48 inches long and 12 inches wide, with black lettering at least 10 inches tall on a yellow background. Red or fluorescent orange flags, at least 16 inches square, go on the widest or longest points of the load. Over-width loads need an amber rotating, flashing, or strobe beacon visible for 500 feet. Over-length loads need alternating red and white retroreflective tape along at least half of each side, and loads wider than 10 feet 6 inches need added tape on the front and rear corners.⁷

Dalton Highway Differences

The Dalton Highway corridor between the Fox Weigh Station and Prudhoe Bay runs on its own rulebook. The legal height limit is 17 feet rather than 15, and permit fees in this corridor shift the height surcharge threshold up to match.⁵

From October 1 through April 15, the normal weekend restrictions are lifted for vehicles traveling north or east of the Fox Weigh Station on the Steese, Elliott, or Dalton Highways. The relaxation covers loads over 10 feet 6 inches wide, with front overhangs beyond 10 feet, rear overhangs beyond 4 feet, overall lengths past 85 feet, or heights above 17 feet, letting carriers use frozen ground to carry heavier loads.⁷

Escort requirements also drop north of Coldfoot at milepost 175. A single required escort isn’t needed north of Coldfoot when overall length is 80 feet or less. When two are specified, one can be dropped if the load is under 65 feet for a single unit or 120 feet for a combination. Even with three or more escorts on the permit, one can be removed for the stretch north of Coldfoot unless the permit says otherwise.⁷

Spring Thaw Weight Restrictions

During spring thaw, melting frost softens the road base and ADOT&PF posts seasonal weight restrictions by region. Timing varies year to year with the weather, and the SouthCoast and Northern regions post separately, so a route crossing both can face two different windows. The postings can cut allowable axle weights below the normal legal limits, which means even trucks that don’t usually need an overweight permit can be restricted. Holding an extended-period overweight permit does not exempt you from a seasonal posting. Check the ADOT&PF weight restriction page before any heavy move in late winter or spring.⁸

Route Responsibility

The permit does not guarantee that every structure along your approved route can clear your load. When you exceed legal height or width, you’re responsible for checking every overpass, underpass, bridge, overhead wire, and horizontal opening before you start. If something along the way won’t clear, you have to reroute or arrange clearance before moving. Leaving the route listed on the permit without prior approval from the permit office is a violation on its own.⁷

Penalties

Overweight fines under AS 45.75.380 scale with how far past the limit you are:⁹

1,001 to 2,000 pounds over: flat $100.
2,001 to 4,000 pounds over: $0.07 per pound.
4,001 to 6,000 pounds over: $0.09 per pound.
6,001 to 10,000 pounds over: $0.12 per pound.
10,001 or more pounds over: $0.15 per pound.

At the top tier, a vehicle 15,000 pounds overweight draws a $2,250 fine, and the per-pound rate climbs quickly on heavy equipment hauls. On top of the fines, ADOT&PF can deny future permits to anyone with three or more unresolved violations, which is a serious problem for a carrier whose work depends on regular oversize or overweight moves.⁴

1
eLaws. Alaska Administrative Code 17 AAC 25.012 – Legal Vehicle Size
2
State of Alaska Department of Transportation and Public Facilities. Alaska Administrative Code 17 AAC Chapter 25 – Operations, Wheeled Vehicles
3
Federal Highway Administration. Bridge Formula Weights
4
Legal Information Institute. Alaska Administrative Code 17 AAC 25.320 – Permits for Oversize or Overweight Vehicles
5
State of Alaska Division of Measurement Standards and Commercial Vehicle Compliance. Permit Fees
6
State of Alaska Department of Transportation and Public Facilities. MS/CVC Commercial Vehicle Customer Service Center
7
State of Alaska Department of Transportation and Public Facilities. Administrative Permit Manual – Oversize and Overweight Permits
8
State of Alaska Department of Transportation and Public Facilities. MS/CVC Commercial Vehicle Weight Restrictions
9
Justia Law. Alaska Statutes 45.75.380 – Offenses and Penalties