Or 224 (hwy 171) over Half Viaduct
FairClackamas County, Oregon · 16.2 MI SE Estacada · Structure no. 16008 171 03973
- Built
- 1970
- 55 years old
- Condition
- Fair
- inspected August 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 198 ft
- 3 main spans
- Daily traffic
- 337
- 2022 count
- Owner
- State
- State Highway Agency
About this bridge
Or 224 (hwy 171) over Half Viaduct is a prestressed concrete stringer/multi-beam or girder carrying Or 224 (hwy 171) over Half Viaduct in Clackamas County, Oregon. It was built in 1970, so it is 55 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 337 vehicles a day, roughly 22% of them trucks, projected to reach 350 by 2042. The structure is 198 ft (60.4 m) long and 28 ft wide. If it were closed, the detour would be 52.8 mi (85 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. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Or 224 (hwy 171) over Half Viaduct built?
It was built in 1970, making it 55 years old in 2025.
What condition is Or 224 (hwy 171) over Half Viaduct 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 Or 224 (hwy 171) over Half Viaduct carry?
About 337 vehicles per day (2022 count), of which roughly 22% are trucks.
How long is Or 224 (hwy 171) over Half Viaduct?
The structure is 198 ft (60.4 m) long with a longest span of 66 ft (20.1 m) and a deck 28 ft wide.
Who owns Or 224 (hwy 171) over Half Viaduct?
It is owned by the State Highway Agency.