Dalton Highway over South Fork Koyukuk River
FairYukon-Koyukuk Census Area, Alaska · Mile Point 155.8 · Structure no. 1260
- Built
- 1972
- 53 years old, rebuilt 1992
- Condition
- Fair
- inspected July 2024
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 423 ft
- 6 main spans
- Daily traffic
- 140
- 2020 count
- Owner
- State
- State Highway Agency
About this bridge
Dalton Highway over South Fork Koyukuk River is a steel stringer/multi-beam or girder carrying Dalton Highway over South Fork Koyukuk River in Yukon-Koyukuk Census Area, Alaska. It was built in 1972 and reconstructed in 1992, so it is 53 years old, older than the Alaska average of 35.9 years.
The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
It carries about 140 vehicles a day, roughly 74% of them trucks, projected to reach 290 by 2039. The structure is 423 ft (128.9 m) long and 28 ft wide. If it were closed, the detour would be 123.7 mi (199 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Dalton Highway over South Fork Koyukuk River built?
It was built in 1972, making it 53 years old in 2025. It was reconstructed in 1992.
What condition is Dalton Highway over South Fork Koyukuk River in?
The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in July 2024.
How much traffic does Dalton Highway over South Fork Koyukuk River carry?
About 140 vehicles per day (2020 count), of which roughly 74% are trucks.
How long is Dalton Highway over South Fork Koyukuk River?
The structure is 423 ft (128.9 m) long with a longest span of 60 ft (18.3 m) and a deck 28 ft wide.
Who owns Dalton Highway over South Fork Koyukuk River?
It is owned by the State Highway Agency.