Seward Highway over Dimond Blvd Underxing
FairAnchorage Municipality, Alaska · Mile Point 121.3 · Structure no. 1325
- Built
- 1976
- 49 years old
- Condition
- Fair
- inspected June 2023
- Type
- Tee Beam
- Prestressed Concrete
- Length
- 110 ft
- 1 main span
- Daily traffic
- 41,300
- 2020 count
- Owner
- State
- State Highway Agency
About this bridge
Seward Highway over Dimond Blvd Underxing is a prestressed concrete tee beam carrying Seward Highway over Dimond Blvd Underxing in Anchorage Municipality, Alaska. It was built in 1976, so it is 49 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 5 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 41,300 vehicles a day, roughly 4% of them trucks, projected to reach 53,500 by 2039. The structure is 110 ft (33.5 m) long and 105 ft wide. If it were closed, the detour would be 1.9 mi (3 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Seward Highway over Dimond Blvd Underxing built?
It was built in 1976, making it 49 years old in 2025.
What condition is Seward Highway over Dimond Blvd Underxing 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 June 2023.
How much traffic does Seward Highway over Dimond Blvd Underxing carry?
About 41,300 vehicles per day (2020 count), of which roughly 4% are trucks.
How long is Seward Highway over Dimond Blvd Underxing?
The structure is 110 ft (33.5 m) long with a longest span of 109 ft (33.2 m) and a deck 105 ft wide.
Who owns Seward Highway over Dimond Blvd Underxing?
It is owned by the State Highway Agency.