Backbone RD over Little Sewickley Creek
FairAllegheny County, Pennsylvania · SL02 Little Sew Crk # 2 · Structure no. 000000000002670
- Built
- 1920
- 105 years old, rebuilt 2019
- Condition
- Fair
- inspected August 2023
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete
- Length
- 42 ft
- 1 main span
- Daily traffic
- 200
- 2023 count
- Owner
- County
- County Highway Agency
About this bridge
Backbone RD over Little Sewickley Creek is a prestressed concrete box beam or girders - multiple carrying Backbone RD over Little Sewickley Creek in Allegheny County, Pennsylvania. It was built in 1920 and reconstructed in 2019, so it is 105 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 200 vehicles a day, roughly 6% of them trucks, projected to reach 250 by 2043. The structure is 42 ft (12.8 m) long and 23 ft wide. If it were closed, the detour would be 3.1 mi (5 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 | 8 Very Good | No problems noted. |
| 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 Backbone RD over Little Sewickley Creek built?
It was built in 1920, making it 105 years old in 2025. It was reconstructed in 2019.
What condition is Backbone RD over Little Sewickley 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 August 2023.
How much traffic does Backbone RD over Little Sewickley Creek carry?
About 200 vehicles per day (2023 count), of which roughly 6% are trucks.
How long is Backbone RD over Little Sewickley Creek?
The structure is 42 ft (12.8 m) long with a longest span of 40 ft (12.2 m) and a deck 23 ft wide.
Who owns Backbone RD over Little Sewickley Creek?
It is owned by the County Highway Agency.