Structure 22143 · Lancaster County, PA
Carries S 4th Street over Shawnee Run, 300 Ft South Of Mill ST.
Set by its lowest-rated component: Superstructure and Substructure at 6 of 9.
How ratings work21 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 | Lancaster |
| Location | 300 Ft South Of Mill ST |
| Carries | S 4th Street |
| Crosses | Shawnee Run |
| Coordinates | 40.02757, -76.49748 |
| Material | Masonry |
| Design | Arch - Deck |
| Total Length | 21.0 ft (6.4 m) |
| Max Span | 21.0 ft (6.4 m) |
| Deck Width | 47.9 ft (14.6 m) |
| Deck Area | 93.4 sq m |
| Main Spans | 1 |
| Year Built | 1850 |
| Avg Daily Traffic | 1,030 (2011) |
| Truck Traffic | 5% |
| Lanes On Bridge | 2 |
| Last Inspection | March 2023 |
| Inspection Frequency | Every 24 months |
| Owner | City/Municipal Highway Agency |
| Historical Significance | Bridge is on the National Register of Historic Places |
| Scour Critical | 7 — Countermeasures installed |
| Structure Number | 000000000022143 |
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.