Structure 12634 · Columbia County, PA
Carries S.r. 1020 over Yost Run, .6 Mi SW Of Jonestown.
A culvert 24 ft across. 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, so those are drawn as typical for a culvert.
| State | Pennsylvania |
| County | Columbia |
| Location | .6 Mi SW Of Jonestown |
| Carries | S.r. 1020 |
| Crosses | Yost Run |
| Coordinates | 41.12612, -76.31317 |
| Material | Concrete |
| Design | Culvert |
| Total Length | 24.0 ft (7.3 m) |
| Max Span | 20.0 ft (6.1 m) |
| Deck Width | 44.3 ft (13.5 m) |
| Deck Area | 98.5 sq m |
| Main Spans | 1 |
| Year Built | 1973 |
| Avg Daily Traffic | 185 (2023) |
| Truck Traffic | 9% |
| Lanes On Bridge | 2 |
| Last Inspection | January 2024 |
| 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 | 000000000012634 |
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.