Denali Highway over Susitna River
PoorMatanuska-Susitna Borough, Alaska · Mile Point 79.5 · Structure no. 0687
- Built
- 1956
- 69 years old
- Condition
- Poor
- inspected July 2023
- Type
- Truss - Deck
- Steel
- Length
- 1,039 ft
- 1 main span
- Daily traffic
- 60
- 2020 count
- Owner
- State
- State Highway Agency
About this bridge
Denali Highway over Susitna River is a steel truss - deck carrying Denali Highway over Susitna River in Matanuska-Susitna Borough, Alaska. It was built in 1956, so it is 69 years old, older than the Alaska average of 35.9 years.
The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: open, would be posted or closed except for temporary shoring.
It carries about 60 vehicles a day, roughly 21% of them trucks, projected to reach 70 by 2039. The structure is 1,039 ft (316.7 m) long and 22 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 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Denali Highway over Susitna River built?
It was built in 1956, making it 69 years old in 2025.
What condition is Denali Highway over Susitna River in?
The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in July 2023.
How much traffic does Denali Highway over Susitna River carry?
About 60 vehicles per day (2020 count), of which roughly 21% are trucks.
How long is Denali Highway over Susitna River?
The structure is 1,039 ft (316.7 m) long with a longest span of 165 ft (50.2 m) and a deck 22 ft wide.
Who owns Denali Highway over Susitna River?
It is owned by the State Highway Agency.