Ramp L over Forbes Ave Diamond St.
FairAllegheny County, Pennsylvania · Rp.From Lib.Br.To SR579NB · Structure no. 000000000002739
- Built
- 1962
- 63 years old, rebuilt 2012
- Condition
- Fair
- inspected August 2024
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 346 ft
- 4 main spans
- Daily traffic
- 14,818
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
Ramp L over Forbes Ave Diamond St. is a steel continuous stringer/multi-beam or girder carrying Ramp L over Forbes Ave Diamond St. in Allegheny County, Pennsylvania. It was built in 1962 and reconstructed in 2012, so it is 63 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 14,818 vehicles a day, roughly 7% of them trucks, projected to reach 20,091 by 2032. The structure is 346 ft (105.5 m) long and 25 ft wide.
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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Ramp L over Forbes Ave Diamond St. built?
It was built in 1962, making it 63 years old in 2025. It was reconstructed in 2012.
What condition is Ramp L over Forbes Ave Diamond St. 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 2024.
How much traffic does Ramp L over Forbes Ave Diamond St. carry?
About 14,818 vehicles per day (2024 count), of which roughly 7% are trucks.
How long is Ramp L over Forbes Ave Diamond St.?
The structure is 346 ft (105.5 m) long with a longest span of 118 ft (36 m) and a deck 25 ft wide.
Who owns Ramp L over Forbes Ave Diamond St.?
It is owned by the State Highway Agency.