T-427 Windy Road over Slippery Rock Creek
FairButler County, Pennsylvania · 0.6 MI NW of Branchton RD · Structure no. 000000000008178
- Built
- 1926
- 99 years old, rebuilt 1993
- Condition
- Fair
- inspected October 2023
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 58 ft
- 1 main span
- Daily traffic
- 100
- 2015 count
- Owner
- County
- County Highway Agency
About this bridge
T-427 Windy Road over Slippery Rock Creek is a steel stringer/multi-beam or girder carrying T-427 Windy Road over Slippery Rock Creek in Butler County, Pennsylvania. It was built in 1926 and reconstructed in 1993, so it is 99 years old, older than the Pennsylvania average of 54.8 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 100 vehicles a day, roughly 9% of them trucks, projected to reach 140 by 2035. The structure is 58 ft (17.7 m) long and 18 ft wide. If it were closed, the detour would be 1.9 mi (3 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 | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was T-427 Windy Road over Slippery Rock Creek built?
It was built in 1926, making it 99 years old in 2025. It was reconstructed in 1993.
What condition is T-427 Windy Road over Slippery Rock Creek 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 2023.
How much traffic does T-427 Windy Road over Slippery Rock Creek carry?
About 100 vehicles per day (2015 count), of which roughly 9% are trucks.
How long is T-427 Windy Road over Slippery Rock Creek?
The structure is 58 ft (17.7 m) long with a longest span of 55 ft (16.8 m) and a deck 18 ft wide.
Who owns T-427 Windy Road over Slippery Rock Creek?
It is owned by the County Highway Agency.