Alaska’s road-travel picture combines a large public network, a relatively small interstate system, seasonal visitor flows, and ferry routes that carry vehicles between communities. The following statistics describe the scale of that system, with measurement periods kept explicit.
Contents
- Public road network
- Interstate extent and vehicle travel
- Highway and ferry visitors
- Alaska Marine Highway vehicle travel
- Denali road-trip distances
- Seasonal access and wildlife movement
Public road network
The Alaska Department of Transportation and Public Facilities reported 17,942 centerline miles of public roads in 2025. The same series reported 17,653 miles in 2024, 17,638 in 2023, and 17,637 in 2022. These are centerline miles, so they describe the length of roadway rather than the combined length of every lane. The source is the state’s Certified Public Road Mileage report.
The recent figures show how the reported network changed over time:
| Year | Public-road centerline miles |
|---|---|
| 2025 | 17,942 |
| 2024 | 17,653 |
| 2023 | 17,638 |
| 2022 | 17,637 |
| 2021 | 17,690 |
| 2020 | 17,681 |
| 2019 | 17,735 |
| 2018 | 17,050 |
| 2017 | 15,535 |
| 2016 | 15,529 |
| 2015 | 16,130 |
| 2014 | 15,728 |
Earlier entries in the state series were 17,690 centerline miles in 2021, 17,681 in 2020, and 17,735 in 2019. The reported total was 17,050 miles in 2018 and 15,535 miles in 2017. It was 15,529 miles in 2016, 16,130 miles in 2015, and 15,728 miles in 2014.
These figures are useful for understanding the scale of road infrastructure available to travelers, but they should not be read as a count of roads or as a measure of paved mileage. The published measure is specifically centerline miles of public roads, and the annual values belong to their respective reporting years.
Interstate extent and vehicle travel
Alaska’s interstate system measured 1,080.204 route miles in 2024 and 2,391.147 lane miles. The difference between those measures reflects the fact that lane miles account for the lanes within the roadway system, while route miles measure the routes themselves. The state’s Extent and Travel Report: Alaska Interstate, 2024 recorded 4,610,307.560 daily vehicle miles across the interstate system.
The four reported interstate routes varied substantially in both length and daily vehicle travel:
| Route | Route miles | Lane miles | Daily vehicle miles |
|---|---|---|---|
| A1 | 407.956 | 922.303 | 1,903,518.686 |
| A2 | 200.751 | 442.573 | 447,602.339 |
| A3 | 147.805 | 331.689 | 1,147,659.190 |
| A4 | 323.693 | 694.582 | 1,111,527.345 |
Route A1 measured 407.956 miles and had 922.303 lane miles in 2024, with 1,903,518.686 daily vehicle miles reported. Route A2 measured 200.751 miles, had 442.573 lane miles, and recorded 447,602.339 daily vehicle miles. Route A3 measured 147.805 miles and had 331.689 lane miles, while its reported daily vehicle miles were 1,147,659.190. Route A4 measured 323.693 miles, had 694.582 lane miles, and recorded 1,111,527.345 daily vehicle miles.
Daily vehicle miles are a travel-volume measure for the reported period. They are not the number of vehicles using Alaska’s roads, and they should not be confused with annual vehicle miles. For trip planning, the figures provide context about the scale of interstate travel; they do not establish a travel time, congestion level, or seasonal road condition.
Highway and ferry visitors
Alaska recorded 2,702,900 out-of-state visitors in summer 2024 under the transportation-market measure covering April through December. The Commercial Passenger Vessel Tax: FY 2016-2025 classified 78,300 of those visitors as highway and/or ferry visitors, representing 3% of out-of-state visitors. The same report counted 839,600 air visitors, or 31%, and 1,785,000 cruise visitors, or 66%.
The highway-and-ferry category was therefore a distinct part of the 2024 visitor mix rather than a description of all travel within Alaska. Its 78,300 visitors were measured within the report’s summer 2024 period, which is stated as April through December.
Historical highway-and/or ferry counts in the same source were 77,100 visitors in summer 2023, 90,500 in summer 2019, 97,200 in summer 2018, 86,100 in summer 2017, and 84,500 in summer 2016. The reported count fell to 7,000 in summer 2020. Those values are visitor counts for the named summer periods; they are not road-traffic counts and do not measure the number of vehicles.
For a compact comparison, the available figures are:
| Summer period | Highway and/or ferry visitors |
|---|---|
| 2024 | 78,300 |
| 2023 | 77,100 |
| 2019 | 90,500 |
| 2018 | 97,200 |
| 2017 | 86,100 |
| 2016 | 84,500 |
| 2020 | 7,000 |
Because the source labels these as out-of-state visitor transportation-market measures, the numbers should be used with their stated definition and period. They do not imply that every highway or ferry journey was made by an out-of-state visitor.
Alaska Marine Highway vehicle travel
The Alaska Marine Highway System provides another way to connect road travel with water travel: passengers can travel with vehicles on eligible routes. Its Annual Traffic Volume Report 2024 recorded 188,006 passengers and 64,044 vehicles in 2024. In 2023, the system carried 181,182 passengers and 63,040 vehicles. In 2022, it carried 154,416 passengers and 56,852 vehicles. The 2020 totals were 52,196 passengers and 27,006 vehicles.
The 2024 system totals were split between Southeast and Southwest Alaska routes. Southeast routes carried 145,292 passengers and 46,135 vehicles. Southwest routes carried 42,714 passengers and 17,909 vehicles. These are route-group totals from the Marine Highway report, not counts of unique travelers or unique vehicles.
Monthly 2024 figures show the seasonal pattern in the reported traffic:
- May: 14,971 passengers and 5,799 vehicles.
- June: 21,015 passengers and 7,044 vehicles.
- July: 29,759 passengers and 9,095 vehicles.
- August: 27,732 passengers and 9,022 vehicles.
- September: 18,950 passengers and 7,122 vehicles.
- December: 10,804 passengers and 3,254 vehicles.
July was the highest of these listed months for both passengers and vehicles, at 29,759 passengers and 9,095 vehicles. August followed with 27,732 passengers and 9,022 vehicles. December’s reported totals were 10,804 passengers and 3,254 vehicles. The report’s monthly counts help explain why a road trip that includes a ferry leg can have a very different seasonal profile from a continuous highway journey.
Denali road-trip distances
Denali National Park and Preserve’s maps identify the Denali Park Road as 92 miles long from the park entrance at Mile 0. The entrance is about 237 highway miles north of Anchorage and about 120 highway miles south of Fairbanks. These are route distances presented by the National Park Service for the 2024 map period, not estimates of driving time.
The road’s internal mile markers provide useful reference points for visitors:
- The Denali Natural History Tour turns around at Primrose Ridge at Mile 17.
- The Tundra Wilderness Tour turns around near the East Fork River at Mile 42.
- All Denali transit buses travel to the East Fork River at Mile 43.
Summer private-vehicle travel is restricted beyond the Savage River crossing at Mile 15, according to National Park Service directions and transportation guidance updated October 31, 2024. In spring or fall, private vehicles may find between 3 and 30 miles of the Denali Park Road open, depending on conditions. The range is a seasonal access description, not a promise that a particular mileage will be open on a particular date.
The National Park Service also reported that a landslide beginning in 2022 blocked vehicle access beyond Mile 43 and reduced the comparable study roadway by 23 miles during 2022-2023. A separate NPS historical description says the Denali Park Road has provided the park’s only motorized vehicle access for 85 years of its history, as described in 2023. These statements describe different aspects of access: the long-term role of the road and the more recent landslide-related limitation.
Seasonal access and wildlife movement
Road travel in Denali is also connected to wildlife management. In a 2006 study summarized by the National Park Service in A Data-driven Approach to Transportation Planning in Denali, Dall sheep moved five times faster when crossing the Denali Park Road than during other activities. Some monitored Dall sheep crossed the road more than 50 times during a four-month study. These findings describe the behavior of monitored animals in that study period; they are not a statewide wildlife statistic.
Denali’s vehicle-management plan sets a goal of meeting vehicle-spacing standards 90% of the time. The reported assessment found that Denali met the standard 60% of the time. At the same time, both of the two currently open vehicle-traffic sites met the vehicle-management standard in 2022, and both met it in 2023. The 90% figure is the management goal, the 60% figure is the reported overall assessment, and the two-site results refer specifically to the currently open vehicle-traffic sites in the named years.
Wildlife-viewing distance statistics add another scale to the road experience. The average grizzly-bear viewing distance from the Denali Park Road since 2013 was 870 feet, or 265 meters. Grizzly bears observed in 2022 were at an average distance of 1,200 feet, or 367 meters, from the road. In 2023, the average observed distance was 1,082 feet, or 330 meters. These are observation averages reported for the stated periods, not guaranteed viewing distances for an individual trip.