Or 78 (hwy 442) over Silvies SLOUGH(5th Br)
FairHarney County, Oregon · 1.1 Mi. E. Jct. US 20/395 · Structure no. 03583A442 00114
- Built
- 1971
- 54 years old
- Condition
- Fair
- inspected October 2024
- Type
- Slab
- Prestressed Concrete
- Length
- 51 ft
- 1 main span
- Daily traffic
- 1,858
- 2022 count
- Owner
- State
- State Highway Agency
About this bridge
Or 78 (hwy 442) over Silvies SLOUGH(5th Br) is a prestressed concrete slab carrying Or 78 (hwy 442) over Silvies SLOUGH(5th 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 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 1,858 vehicles a day, roughly 37% of them trucks, projected to reach 2,000 by 2042. The structure is 51 ft (15.5 m) long and 36 ft wide. If it were closed, the detour would be 14.3 mi (23 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 | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Or 78 (hwy 442) over Silvies SLOUGH(5th Br) built?
It was built in 1971, making it 54 years old in 2025.
What condition is Or 78 (hwy 442) over Silvies SLOUGH(5th Br) 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 October 2024.
How much traffic does Or 78 (hwy 442) over Silvies SLOUGH(5th Br) carry?
About 1,858 vehicles per day (2022 count), of which roughly 37% are trucks.
How long is Or 78 (hwy 442) over Silvies SLOUGH(5th Br)?
The structure is 51 ft (15.5 m) long with a longest span of 50 ft (15.2 m) and a deck 36 ft wide.
Who owns Or 78 (hwy 442) over Silvies SLOUGH(5th Br)?
It is owned by the State Highway Agency.