Old Experiment Sta over Poison Slough
GoodHarney County, Oregon · 005 MI US 20 · Structure no. 22358 C11400047
- Built
- 2015
- 10 years old
- Condition
- Good
- inspected September 2024
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 36 ft
- 1 main span
- Daily traffic
- 117
- 2015 count
- Owner
- County
- County Highway Agency
About this bridge
Old Experiment Sta over Poison Slough is a steel stringer/multi-beam or girder carrying Old Experiment Sta over Poison Slough in Harney County, Oregon. It was built in 2015, so it is 10 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 117 vehicles a day, roughly 10% of them trucks, projected to reach 169 by 2030. The structure is 36 ft (10.9 m) long and 28 ft wide. If it were closed, the detour would be 3.7 mi (6 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 | 7 Good | Some minor problems. |
| Superstructure | 8 Very Good | No problems noted. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Old Experiment Sta over Poison Slough built?
It was built in 2015, making it 10 years old in 2025.
What condition is Old Experiment Sta over Poison 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 Old Experiment Sta over Poison Slough carry?
About 117 vehicles per day (2015 count), of which roughly 10% are trucks.
How long is Old Experiment Sta over Poison Slough?
The structure is 36 ft (10.9 m) long with a longest span of 36 ft (10.9 m) and a deck 28 ft wide.
Who owns Old Experiment Sta over Poison Slough?
It is owned by the County Highway Agency.