ST 3 A/boston RD over Water Concord River
Fair Condition106 years old18,283 vehicles/day
Location
| State | Massachusetts |
| County | Middlesex |
| Location | 1 Mi N Of Billerica Ctr |
| Carries | ST 3 A/boston RD |
| Crosses | Water Concord River |
| Coordinates | 42.57410, -71.28023 |
Condition Ratings
| Overall Condition | Fair |
| Superstructure | 6 (Satisfactory) |
| Substructure | 6 (Satisfactory) |
| Channel/Waterway | 7 (Good) |
| Scour Critical | 4 — Foundations need monitoring |
Physical Characteristics
| Material | Concrete |
| Design | Arch - Deck |
| Total Length | 180.1 ft (54.9 m) |
| Max Span | 65.0 ft (19.8 m) |
| Deck Width | 39.7 ft (12.1 m) |
| Deck Area | 664.3 sq m |
| Main Spans | 3 |
| Year Built | 1920 |
Traffic
| Avg Daily Traffic | 18,283 (2023) |
| Truck Traffic | 7% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | October 2024 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is possibly eligible (requires evaluation) |
| Structure Number | B120032DGDOTNBI |