Road over Zigzag River
FairClackamas County, Oregon · S-17 T-3S R-8E Wm · Structure no. 060609000001457
- Built
- 1950
- 75 years old
- Condition
- Fair
- inspected September 2023
- Type
- Stringer/Multi-beam or Girder
- Wood or Timber
- Length
- 52 ft
- 1 main span
- Daily traffic
- 25
- Owner
- Federal
- U.S. Forest Service
About this bridge
Road over Zigzag River is a wood or timber stringer/multi-beam or girder carrying Road over Zigzag River in Clackamas County, Oregon. It was built in 1950, so it is 75 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 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 25 vehicles a day, projected to reach 37 by 2045. The structure is 52 ft (15.8 m) long and 19 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Road over Zigzag River built?
It was built in 1950, making it 75 years old in 2025.
What condition is Road over Zigzag 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 September 2023.
How much traffic does Road over Zigzag River carry?
About 25 vehicles per day (latest count).
How long is Road over Zigzag River?
The structure is 52 ft (15.8 m) long with a longest span of 50 ft (15.2 m) and a deck 19 ft wide.
Who owns Road over Zigzag River?
It is owned by the U.S. Forest Service.