ST 1 A/off Ramp over HWY M Caughlin & Relie
Fair Condition75 years old12,413 vehicles/day
Location
| State | Massachusetts |
| County | Suffolk |
| Location | .8 Mi NE Of Callahan Tun. |
| Carries | ST 1 A/off Ramp |
| Crosses | HWY M Caughlin & Relie |
| Coordinates | 42.37907, -71.02534 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 6 (Satisfactory) |
| Superstructure | 7 (Good) |
| Substructure | 5 (Fair) |
| Scour Critical | Not applicable |
Physical Characteristics
| Material | Steel |
| Design | Stringer/Multi-beam |
| Total Length | 304.1 ft (92.7 m) |
| Max Span | 80.1 ft (24.4 m) |
| Deck Width | 29.9 ft (9.1 m) |
| Deck Area | 843.6 sq m |
| Main Spans | 4 |
| Year Built | 1951 (reconstructed 1977) |
Traffic
| Avg Daily Traffic | 12,413 (2024) |
| Truck Traffic | 9% |
| Lanes On Bridge | 1 |
Inspection & Ownership
| Last Inspection | 124 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | B1623639PDOTNBI |