Or 78 (hwy 442) over Silvies SLOUGH(12th Br)
GoodHarney County, Oregon · 2.9 Mi. E. Jct. US 20/395 · Structure no. 03590A442 00290
- Built
- 1971
- 54 years old
- Condition
- Good
- inspected October 2024
- Type
- Slab
- Prestressed Concrete
- Length
- 31 ft
- 1 main span
- Daily traffic
- 1,299
- 2022 count
- Owner
- State
- State Highway Agency
About this bridge
Or 78 (hwy 442) over Silvies SLOUGH(12th Br) is a prestressed concrete slab carrying Or 78 (hwy 442) over Silvies SLOUGH(12th Br) in Harney County, Oregon. It was built in 1971, so it is 54 years old, older 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 1,299 vehicles a day, roughly 33% of them trucks, projected to reach 1,700 by 2042. The structure is 31 ft (9.4 m) long and 36 ft wide. If it were closed, the detour would be 28 mi (45 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 | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Or 78 (hwy 442) over Silvies SLOUGH(12th Br) built?
It was built in 1971, making it 54 years old in 2025.
What condition is Or 78 (hwy 442) over Silvies SLOUGH(12th Br) 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 2024.
How much traffic does Or 78 (hwy 442) over Silvies SLOUGH(12th Br) carry?
About 1,299 vehicles per day (2022 count), of which roughly 33% are trucks.
How long is Or 78 (hwy 442) over Silvies SLOUGH(12th Br)?
The structure is 31 ft (9.4 m) long with a longest span of 30 ft (9.1 m) and a deck 36 ft wide.
Who owns Or 78 (hwy 442) over Silvies SLOUGH(12th Br)?
It is owned by the State Highway Agency.