HWY 81SB - HWY 171 over Johnson Ck
FairClackamas County, Oregon · At HWY 81 & 171 Intchge · Structure no. 09670A01EC00551
- Built
- 1968
- 57 years old, rebuilt 1991
- Condition
- Fair
- inspected November 2024
- Type
- Slab
- Concrete Continuous
- Length
- 150 ft
- 3 main spans
- Daily traffic
- 11,588
- 2022 count
- Owner
- State
- State Highway Agency
About this bridge
HWY 81SB - HWY 171 over Johnson Ck is a concrete continuous slab carrying HWY 81SB - HWY 171 over Johnson Ck in Clackamas County, Oregon. It was built in 1968 and reconstructed in 1991, so it is 57 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 11,588 vehicles a day, roughly 1% of them trucks, projected to reach 13,950 by 2042. The structure is 150 ft (45.7 m) long and 39 ft wide. If it were closed, the detour would be 1.9 mi (3 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 | 8 Very Good | No problems noted. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| 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 HWY 81SB - HWY 171 over Johnson Ck built?
It was built in 1968, making it 57 years old in 2025. It was reconstructed in 1991.
What condition is HWY 81SB - HWY 171 over Johnson Ck 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 November 2024.
How much traffic does HWY 81SB - HWY 171 over Johnson Ck carry?
About 11,588 vehicles per day (2022 count), of which roughly 1% are trucks.
How long is HWY 81SB - HWY 171 over Johnson Ck?
The structure is 150 ft (45.7 m) long with a longest span of 60 ft (18.3 m) and a deck 39 ft wide.
Who owns HWY 81SB - HWY 171 over Johnson Ck?
It is owned by the State Highway Agency.