Structure 20997 · Lancaster County, PA
Carries US Route 30 over Susquehanna R;nsrr;t-791, Columbia Borough.
5,640 ft end to end, longest span 127 ft: about 16 football fields, or 1.1 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 girder bridge.
| State | Pennsylvania |
| County | Lancaster |
| Location | Columbia Borough |
| Carries | US Route 30 |
| Crosses | Susquehanna R;nsrr;t-791 |
| Coordinates | 40.03394, -76.53199 |
| Material | Steel Continuous |
| Design | Girder and Floorbeam |
| Total Length | 5640.1 ft (1719.1 m) |
| Max Span | 127.0 ft (38.7 m) |
| Deck Width | 86.9 ft (26.5 m) |
| Deck Area | 45556.2 sq m |
| Main Spans | 44 |
| Year Built | 1972 (reconstructed 2024) |
| Avg Daily Traffic | 48,561 (2023) |
| Truck Traffic | 12% |
| Lanes On Bridge | 4 |
| Lanes Under Bridge | 2 |
| Last Inspection | May 2023 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Scour Critical | 8 — Stable, low risk |
| Structure Number | 000000000020997 |
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.