T456 Old Mill Run over Mill Run
Poor Condition69 years old622 vehicles/day
Location
| State | Pennsylvania |
| County | Blair |
| Location | 1 Mi.w.of Altoona |
| Carries | T456 Old Mill Run |
| Crosses | Mill Run |
| Coordinates | 40.50721, -78.43680 |
Condition Ratings
| Overall Condition | Poor |
| Deck | 3 (Serious) |
| Superstructure | 3 (Serious) |
| Substructure | 4 (Poor) |
| Channel/Waterway | 6 (Satisfactory) |
| Scour Critical | 4 — Foundations need monitoring |
Physical Characteristics
| Material | Prestressed Concrete |
| Design | Box Beam - Multiple |
| Total Length | 40.0 ft (12.2 m) |
| Max Span | 39.0 ft (11.9 m) |
| Deck Width | 21.7 ft (6.6 m) |
| Deck Area | 80.5 sq m |
| Main Spans | 1 |
| Year Built | 1957 |
Traffic
| Avg Daily Traffic | 622 (2023) |
| Truck Traffic | 1% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | October 2024 |
| Inspection Frequency | Every 12 months |
| Owner | County Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 000000000005940 |