I 495 SB over HWY Commonwealth DR
Fair Condition64 years old60,077 vehicles/day
Location
| State | Massachusetts |
| County | Essex |
| Location | .4 Mi N Merrimac River |
| Carries | I 495 SB |
| Crosses | HWY Commonwealth DR |
| Coordinates | 42.71389, -71.13743 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 6 (Satisfactory) |
| Superstructure | 7 (Good) |
| Substructure | 6 (Satisfactory) |
| Scour Critical | Not applicable |
Physical Characteristics
| Material | Steel |
| Design | Stringer/Multi-beam |
| Total Length | 103.0 ft (31.4 m) |
| Max Span | 46.9 ft (14.3 m) |
| Deck Width | 56.1 ft (17.1 m) |
| Deck Area | 536.9 sq m |
| Main Spans | 3 |
| Year Built | 1962 |
Traffic
| Avg Daily Traffic | 60,077 (2023) |
| Truck Traffic | 10% |
| Lanes On Bridge | 3 |
| Lanes Under Bridge | 2 |
Inspection & Ownership
| Last Inspection | 223 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is possibly eligible (requires evaluation) |
| Structure Number | L040402XADOTNBI |