IRR C106 over Ninemile Slough
GoodHarney County, Oregon · 046 US HWY 20 · Structure no. 20455 C10600461
- Built
- 2006
- 19 years old
- Condition
- Good
- inspected September 2024
- Type
- Slab
- Prestressed Concrete
- Length
- 36 ft
- 1 main span
- Daily traffic
- 179
- 2020 count
- Owner
- County
- County Highway Agency
About this bridge
IRR C106 over Ninemile Slough is a prestressed concrete slab carrying IRR C106 over Ninemile Slough in Harney County, Oregon. It was built in 2006, so it is 19 years old, younger than the Oregon average of 49.9 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 179 vehicles a day, roughly 20% of them trucks, projected to reach 209 by 2025. The structure is 36 ft (11 m) long and 28 ft wide. If it were closed, the detour would be 31.1 mi (50 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 8 Very Good | No problems noted. |
| Superstructure | 8 Very Good | No problems noted. |
| Substructure | 8 Very Good | No problems noted. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was IRR C106 over Ninemile Slough built?
It was built in 2006, making it 19 years old in 2025.
What condition is IRR C106 over Ninemile Slough in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in September 2024.
How much traffic does IRR C106 over Ninemile Slough carry?
About 179 vehicles per day (2020 count), of which roughly 20% are trucks.
How long is IRR C106 over Ninemile Slough?
The structure is 36 ft (11 m) long with a longest span of 35 ft (10.7 m) and a deck 28 ft wide.
Who owns IRR C106 over Ninemile Slough?
It is owned by the County Highway Agency.