I-376 over Commercial St. & Nine MI
FairAllegheny County, Pennsylvania · Commercial Street Bridge · Structure no. 000000000001167
- Built
- 1950
- 75 years old, rebuilt 2007
- Condition
- Fair
- inspected June 2023
- Type
- Arch - Deck
- Concrete
- Length
- 863 ft
- 3 main spans
- Daily traffic
- 65,232
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
I-376 over Commercial St. & Nine MI is a concrete arch - deck carrying I-376 over Commercial St. & Nine MI in Allegheny County, Pennsylvania. It was built in 1950 and reconstructed in 2007, so it is 75 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 5 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 65,232 vehicles a day, roughly 7% of them trucks, projected to reach 53,599 by 2032. The structure is 863 ft (263 m) long and 75 ft wide. If it were closed, the detour would be 6.8 mi (11 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I-376 over Commercial St. & Nine MI built?
It was built in 1950, making it 75 years old in 2025. It was reconstructed in 2007.
What condition is I-376 over Commercial St. & Nine MI 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 June 2023.
How much traffic does I-376 over Commercial St. & Nine MI carry?
About 65,232 vehicles per day (2024 count), of which roughly 7% are trucks.
How long is I-376 over Commercial St. & Nine MI?
The structure is 863 ft (263 m) long with a longest span of 176 ft (53.6 m) and a deck 75 ft wide.
Who owns I-376 over Commercial St. & Nine MI?
It is owned by the State Highway Agency.