Merriman RD over Big Sewickley Creek
FairAllegheny County, Pennsylvania · SB08 Big Sewickley CR#8 · Structure no. 000000000002724
- Built
- 1916
- 109 years old
- Condition
- Fair
- inspected August 2023
- Type
- Arch - Deck
- Concrete
- Length
- 50 ft
- 1 main span
- Daily traffic
- 408
- 2023 count
- Owner
- County
- County Highway Agency
About this bridge
Merriman RD over Big Sewickley Creek is a concrete arch - deck carrying Merriman RD over Big Sewickley Creek in Allegheny County, Pennsylvania. It was built in 1916, so it is 109 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 408 vehicles a day, roughly 1% of them trucks, projected to reach 510 by 2043. The structure is 50 ft (15.2 m) long and 24 ft wide. If it were closed, the detour would be 6.2 mi (10 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 |
|---|---|---|
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| 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 Merriman RD over Big Sewickley Creek built?
It was built in 1916, making it 109 years old in 2025.
What condition is Merriman RD over Big 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 Merriman RD over Big Sewickley Creek carry?
About 408 vehicles per day (2023 count), of which roughly 1% are trucks.
How long is Merriman RD over Big Sewickley Creek?
The structure is 50 ft (15.2 m) long with a longest span of 50 ft (15.2 m) and a deck 24 ft wide.
Who owns Merriman RD over Big Sewickley Creek?
It is owned by the County Highway Agency.