Old Glenn Palmer over Knik River
FairMatanuska-Susitna Borough, Alaska · Mile Point 8.7 · Structure no. 0539
- Built
- 1975
- 50 years old
- Condition
- Fair
- inspected June 2024
- Type
- Box Beam or Girders - Multiple
- Steel Continuous
- Length
- 506 ft
- 3 main spans
- Daily traffic
- 1,380
- 2020 count
- Owner
- State
- State Highway Agency
About this bridge
Old Glenn Palmer over Knik River is a steel continuous box beam or girders - multiple carrying Old Glenn Palmer over Knik River in Matanuska-Susitna Borough, Alaska. It was built in 1975, so it is 50 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 1,380 vehicles a day, roughly 5% of them trucks, projected to reach 1,790 by 2039. The structure is 506 ft (154.1 m) long and 29 ft wide. If it were closed, the detour would be 26.7 mi (43 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| 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 Old Glenn Palmer over Knik River built?
It was built in 1975, making it 50 years old in 2025.
What condition is Old Glenn Palmer over Knik 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 June 2024.
How much traffic does Old Glenn Palmer over Knik River carry?
About 1,380 vehicles per day (2020 count), of which roughly 5% are trucks.
How long is Old Glenn Palmer over Knik River?
The structure is 506 ft (154.1 m) long with a longest span of 190 ft (57.9 m) and a deck 29 ft wide.
Who owns Old Glenn Palmer over Knik River?
It is owned by the State Highway Agency.