Upper Imnaha Road over Grouse Creek
FairWallowa County, Oregon · 18.4 MI S of HWY 350 · Structure no. 63C78 727 01841
- Built
- 1967
- 58 years old
- Condition
- Fair
- inspected September 2024
- Type
- Girder and Floorbeam System
- Steel
- Length
- 42 ft
- 1 main span
- Daily traffic
- 72
- 2020 count
- Owner
- County
- County Highway Agency
About this bridge
Upper Imnaha Road over Grouse Creek is a steel girder and floorbeam system carrying Upper Imnaha Road over Grouse Creek in Wallowa County, Oregon. It was built in 1967, so it is 58 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 72 vehicles a day, roughly 5% of them trucks, projected to reach 87 by 2025. The structure is 42 ft (12.8 m) long and 18 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Upper Imnaha Road over Grouse Creek built?
It was built in 1967, making it 58 years old in 2025.
What condition is Upper Imnaha Road over Grouse Creek 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 Grouse Creek carry?
About 72 vehicles per day (2020 count), of which roughly 5% are trucks.
How long is Upper Imnaha Road over Grouse Creek?
The structure is 42 ft (12.8 m) long with a longest span of 38 ft (11.6 m) and a deck 18 ft wide.
Who owns Upper Imnaha Road over Grouse Creek?
It is owned by the County Highway Agency.