Deibler Gap T-474 over Mahantango Creek
Poor Condition126 years old
Location
| State | Pennsylvania |
| County | Dauphin |
| Location | Seaman Bridge |
| Carries | Deibler Gap T-474 |
| Crosses | Mahantango Creek |
| Coordinates | 40.62577, -76.85575 |
Condition Ratings
| Overall Condition | Poor |
| Deck | 1 (Imminent Failure) |
| Superstructure | 1 (Imminent Failure) |
| Substructure | 5 (Fair) |
| Channel/Waterway | 5 (Fair) |
| Scour Critical | 4 — Foundations need monitoring |
Physical Characteristics
| Material | Steel |
| Design | Truss - Thru |
| Total Length | 168.0 ft (51.2 m) |
| Max Span | 162.1 ft (49.4 m) |
| Deck Width | 16.1 ft (4.9 m) |
| Deck Area | 250.9 sq m |
| Main Spans | 1 |
| Year Built | 1900 |
Inspection & Ownership
| Last Inspection | 823 |
| Inspection Frequency | Every 24 months |
| Owner | County Highway Agency |
| Historical Significance | Bridge is on the National Register of Historic Places |
| Structure Number | 000000000014693 |