HWY School ST over Water Northern Canal
Fair Condition178 years old27,672 vehicles/day
Location
| State | Massachusetts |
| County | Middlesex |
| Location | Just S Of Merrimack Riv |
| Carries | HWY School ST |
| Crosses | Water Northern Canal |
| Coordinates | 42.64937, -71.33006 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 7 (Good) |
| Superstructure | 6 (Satisfactory) |
| Substructure | 6 (Satisfactory) |
| Channel/Waterway | 7 (Good) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Masonry |
| Design | Arch - Deck |
| Total Length | 158.1 ft (48.2 m) |
| Max Span | 39.0 ft (11.9 m) |
| Deck Width | 60.0 ft (18.3 m) |
| Deck Area | 882.1 sq m |
| Main Spans | 4 |
| Year Built | 1848 (reconstructed 2005) |
Traffic
| Avg Daily Traffic | 27,672 (2024) |
| Truck Traffic | 5% |
| Lanes On Bridge | 3 |
Inspection & Ownership
| Last Inspection | October 2024 |
| Inspection Frequency | Every 24 months |
| Owner | City/Municipal Highway Agency |
| Historical Significance | Bridge is on the National Register of Historic Places |
| Structure Number | L150222BUMUNNBI |