Napton C-1057 over So Owyhee Canal
GoodMalheur County, Oregon · 0.1 MI N ST HWY 201 · Structure no. 45C1361057 0390
- Built
- 1993
- 32 years old
- Condition
- Good
- inspected October 2023
- Type
- Slab
- Prestressed Concrete
- Length
- 22 ft
- 1 main span
- Daily traffic
- 297
- 2020 count
- Owner
- County
- County Highway Agency
About this bridge
Napton C-1057 over So Owyhee Canal is a prestressed concrete slab carrying Napton C-1057 over So Owyhee Canal in Malheur County, Oregon. It was built in 1993, so it is 32 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 297 vehicles a day, roughly 20% of them trucks, projected to reach 357 by 2025. The structure is 22 ft (6.7 m) long and 28 ft wide. If it were closed, the detour would be 3.1 mi (5 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 | 7 Good | Some minor problems. |
| 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 Napton C-1057 over So Owyhee Canal built?
It was built in 1993, making it 32 years old in 2025.
What condition is Napton C-1057 over So Owyhee Canal 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 October 2023.
How much traffic does Napton C-1057 over So Owyhee Canal carry?
About 297 vehicles per day (2020 count), of which roughly 20% are trucks.
How long is Napton C-1057 over So Owyhee Canal?
The structure is 22 ft (6.7 m) long with a longest span of 21 ft (6.4 m) and a deck 28 ft wide.
Who owns Napton C-1057 over So Owyhee Canal?
It is owned by the County Highway Agency.