Or 78 (hwy 442) over Silvies SLOUGH(15th Br)
FairHarney County, Oregon · 3.6 Mi. E. Jct. US 20/395 · Structure no. 03593A442 00361
- Built
- 1971
- 54 years old
- Condition
- Fair
- 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(15th Br) is a prestressed concrete slab carrying Or 78 (hwy 442) over Silvies SLOUGH(15th 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 1,299 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 3.7 mi (6 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 | 8 Very Good | No problems noted. |
| 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(15th Br) built?
It was built in 1971, making it 54 years old in 2025.
What condition is Or 78 (hwy 442) over Silvies SLOUGH(15th 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(15th 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(15th 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(15th Br)?
It is owned by the State Highway Agency.