Road over Collawash River
FairClackamas County, Oregon · S-27 T-6S R-6E Wm · Structure no. 060605000001571
- Built
- 1956
- 69 years old
- Condition
- Fair
- inspected August 2023
- Type
- Arch - Deck
- Concrete
- Length
- 327 ft
- 1 main span
- Daily traffic
- 100
- Owner
- Federal
- U.S. Forest Service
About this bridge
Road over Collawash River is a concrete arch - deck carrying Road over Collawash River in Clackamas County, Oregon. It was built in 1956, so it is 69 years old, older than the Oregon average of 49.9 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 100 vehicles a day, roughly 10% of them trucks, projected to reach 150 by 2045. The structure is 327 ft (99.8 m) long and 31 ft wide. If it were closed, the detour would be 620.7 mi (999 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 Road over Collawash River built?
It was built in 1956, making it 69 years old in 2025.
What condition is Road over Collawash 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 Road over Collawash River carry?
About 100 vehicles per day (latest count), of which roughly 10% are trucks.
How long is Road over Collawash River?
The structure is 327 ft (99.8 m) long with a longest span of 160 ft (48.8 m) and a deck 31 ft wide.
Who owns Road over Collawash River?
It is owned by the U.S. Forest Service.