Structure 2162 · Allegheny County, PA
Carries Pearce Mill RD over Irwin Run, Iw01 Irwin Run No. 1.
Set by its lowest-rated component: Superstructure and Substructure at 6 of 9.
How ratings work23 ft end to end. Lengths are drawn to scale; at this length a semi-truck would be a speck. Each part is colored by its latest inspection rating. The inventory records lengths but not heights or the layout of the shorter spans, so those are drawn as typical for a deck arch.
| State | Pennsylvania |
| County | Allegheny |
| Location | Iw01 Irwin Run No. 1 |
| Carries | Pearce Mill RD |
| Crosses | Irwin Run |
| Coordinates | 40.59759, -79.99785 |
| Material | Concrete |
| Design | Arch - Deck |
| Total Length | 23.0 ft (7 m) |
| Max Span | 23.0 ft (7 m) |
| Deck Width | 50.2 ft (15.3 m) |
| Deck Area | 107.1 sq m |
| Main Spans | 1 |
| Year Built | 1936 |
| Avg Daily Traffic | 3,569 (2005) |
| Truck Traffic | 3% |
| Lanes On Bridge | 2 |
| Last Inspection | June 2023 |
| Inspection Frequency | Every 24 months |
| Owner | County Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Scour Critical | 5 — Stable for scour |
| Structure Number | 000000000002162 |
Inspectors rate each major part of a bridge (the deck you drive on, the superstructure of beams that holds it up, and the substructure of piers and abutments beneath) on a 0–9 scale. A bridge's overall condition is its lowest of those ratings, so one deteriorated component makes the whole bridge "poor."
A poor rating is not a closure. It means the bridge is flagged for priority repair or replacement; bridges judged unsafe are closed or posted with weight limits. The waterway (channel) rating is reported, but it does not count toward the overall classification.