Steese Highway over Mammoth Creek
FairYukon-Koyukuk Census Area, Alaska · Mile Point 111.1 · Structure no. 0831
- Built
- 1971
- 54 years old
- Condition
- Fair
- inspected August 2024
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 47 ft
- 1 main span
- Daily traffic
- 140
- 2020 count
- Owner
- State
- State Highway Agency
About this bridge
Steese Highway over Mammoth Creek is a steel stringer/multi-beam or girder carrying Steese Highway over Mammoth Creek in Yukon-Koyukuk Census Area, Alaska. It was built in 1971, so it is 54 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 13% of them trucks, projected to reach 300 by 2039. The structure is 47 ft (14.2 m) long and 29 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Steese Highway over Mammoth Creek built?
It was built in 1971, making it 54 years old in 2025.
What condition is Steese Highway over Mammoth Creek 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 August 2024.
How much traffic does Steese Highway over Mammoth Creek carry?
About 140 vehicles per day (2020 count), of which roughly 13% are trucks.
How long is Steese Highway over Mammoth Creek?
The structure is 47 ft (14.2 m) long with a longest span of 45 ft (13.7 m) and a deck 29 ft wide.
Who owns Steese Highway over Mammoth Creek?
It is owned by the State Highway Agency.