US 1 Sb/b Mystc U over US 1 Nb/big Mystic Lowr
Fair Condition76 years old41,655 vehicles/day
Location
| State | Massachusetts |
| County | Suffolk |
| Location | Big Mystic Upper |
| Carries | US 1 Sb/b Mystc U |
| Crosses | US 1 Nb/big Mystic Lowr |
| Coordinates | 42.38510, -71.04729 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 6 (Satisfactory) |
| Superstructure | 5 (Fair) |
| Substructure | 6 (Satisfactory) |
| Channel/Waterway | 7 (Good) |
| Scour Critical | Not applicable |
Physical Characteristics
| Material | Steel Continuous |
| Design | Truss - Thru |
| Total Length | 1524.0 ft (464.5 m) |
| Max Span | 800.9 ft (244.1 m) |
| Deck Width | 41.7 ft (12.7 m) |
| Deck Area | 5899.1 sq m |
| Main Spans | 3 |
| Year Built | 1950 |
Traffic
| Avg Daily Traffic | 41,655 (2022) |
| Truck Traffic | 9% |
| Lanes On Bridge | 3 |
| Lanes Under Bridge | 3 |
Inspection & Ownership
| Last Inspection | November 2023 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is possibly eligible (requires evaluation) |
| Structure Number | B160174X4DOTNBI |