Sterling Highway over Kasilof River
FairKenai Peninsula Borough, Alaska · Mile Point 71.2 · Structure no. 0670
- Built
- 1966
- 59 years old
- Condition
- Fair
- inspected August 2023
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 284 ft
- 3 main spans
- Daily traffic
- 5,770
- 2020 count
- Owner
- State
- State Highway Agency
About this bridge
Sterling Highway over Kasilof River is a steel continuous stringer/multi-beam or girder carrying Sterling Highway over Kasilof River in Kenai Peninsula Borough, Alaska. It was built in 1966, so it is 59 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 5,770 vehicles a day, roughly 8% of them trucks, projected to reach 6,570 by 2039. The structure is 284 ft (86.5 m) long and 35 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 | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Sterling Highway over Kasilof River built?
It was built in 1966, making it 59 years old in 2025.
What condition is Sterling Highway over Kasilof 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 August 2023.
How much traffic does Sterling Highway over Kasilof River carry?
About 5,770 vehicles per day (2020 count), of which roughly 8% are trucks.
How long is Sterling Highway over Kasilof River?
The structure is 284 ft (86.5 m) long with a longest span of 110 ft (33.5 m) and a deck 35 ft wide.
Who owns Sterling Highway over Kasilof River?
It is owned by the State Highway Agency.