Structure 42057 · Allegheny County, PA
Carries East Main Street over Chartiers Creek, 1/4 Mile SW Carnegie.
Set by its lowest-rated component: Deck and Superstructure and Substructure at 4 of 9.
How ratings work138 ft end to end, longest span 71 ft. Lengths and the semi-truck on the deck are drawn to the same scale. 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 rigid-frame bridge.
| State | Pennsylvania |
| County | Allegheny |
| Location | 1/4 Mile SW Carnegie |
| Carries | East Main Street |
| Crosses | Chartiers Creek |
| Coordinates | 40.40677, -80.08806 |
| Material | Concrete |
| Design | Frame |
| Total Length | 138.1 ft (42.1 m) |
| Max Span | 70.9 ft (21.6 m) |
| Deck Width | 54.8 ft (16.7 m) |
| Deck Area | 703.1 sq m |
| Main Spans | 2 |
| Year Built | 1934 (reconstructed 2002) |
| Avg Daily Traffic | 1,200 (2019) |
| Truck Traffic | 1% |
| Lanes On Bridge | 2 |
| Last Inspection | August 2023 |
| Inspection Frequency | Every 24 months |
| Owner | City/Municipal Highway Agency |
| Historical Significance | Historical significance is not determined |
| Scour Critical | 4 — Foundations need monitoring |
| Structure Number | 000000000042057 |
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.