Upper Imnaha Road over Imnaha River
FairWallowa County, Oregon · 12.6 MI S of HWY 350 · Structure no. 16257 727 01259
- Built
- 1978
- 47 years old
- Condition
- Fair
- inspected September 2024
- Type
- Tee Beam
- Prestressed Concrete
- Length
- 114 ft
- 1 main span
- Daily traffic
- 94
- 2020 count
- Owner
- County
- County Highway Agency
About this bridge
Upper Imnaha Road over Imnaha River is a prestressed concrete tee beam carrying Upper Imnaha Road over Imnaha River in Wallowa County, Oregon. It was built in 1978, so it is 47 years old, younger 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 94 vehicles a day, roughly 5% of them trucks, projected to reach 109 by 2025. The structure is 114 ft (34.7 m) long and 31 ft wide. If it were closed, the detour would be 18 mi (29 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 | 8 Very Good | No problems noted. |
| 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 Upper Imnaha Road over Imnaha River built?
It was built in 1978, making it 47 years old in 2025.
What condition is Upper Imnaha Road over Imnaha 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 2024.
How much traffic does Upper Imnaha Road over Imnaha River carry?
About 94 vehicles per day (2020 count), of which roughly 5% are trucks.
How long is Upper Imnaha Road over Imnaha River?
The structure is 114 ft (34.7 m) long with a longest span of 112 ft (34.1 m) and a deck 31 ft wide.
Who owns Upper Imnaha Road over Imnaha River?
It is owned by the County Highway Agency.