Structure 21270 · Lancaster County, PA
Carries Pa 462; SR 0462 over Susque Rvr;sr0624 Ns Rr, Columbia Borough.
Set by its lowest-rated component: Deck and Superstructure at 4 of 9.
How ratings work6,657 ft end to end, longest span 185 ft: about 18 football fields, or 1.3 miles. 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 | Lancaster |
| Location | Columbia Borough |
| Carries | Pa 462; SR 0462 |
| Crosses | Susque Rvr;sr0624 Ns Rr |
| Coordinates | 40.02550, -76.52906 |
| Material | Concrete |
| Design | Arch - Deck |
| Total Length | 6657.2 ft (2029.1 m) |
| Max Span | 185.0 ft (56.4 m) |
| Deck Width | 47.9 ft (14.6 m) |
| Deck Area | 29624.9 sq m |
| Main Spans | 28 |
| Year Built | 1929 (reconstructed 1988) |
| Avg Daily Traffic | 10,826 (2024) |
| Truck Traffic | 3% |
| Lanes On Bridge | 2 |
| Lanes Under Bridge | 4 |
| Last Inspection | August 2024 |
| Inspection Frequency | Every 12 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is on the National Register of Historic Places |
| Scour Critical | 8 — Stable, low risk |
| Structure Number | 000000000021270 |
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.