ST 9 Boylston ST over Water Hemlock Gorge
Fair Condition94 years old53,100 vehicles/day
Location
| State | Massachusetts |
| County | Middlesex |
| Location | At Quinobequin RD |
| Carries | ST 9 Boylston ST |
| Crosses | Water Hemlock Gorge |
| Coordinates | 42.31684, -71.22804 |
Condition Ratings
| Overall Condition | Fair |
| Superstructure | 5 (Fair) |
| Substructure | 6 (Satisfactory) |
| Channel/Waterway | 7 (Good) |
| Scour Critical | 4 — Foundations need monitoring |
Physical Characteristics
| Material | Concrete |
| Design | Arch - Deck |
| Total Length | 23.0 ft (7 m) |
| Max Span | 20.0 ft (6.1 m) |
| Deck Width | 185.7 ft (56.6 m) |
| Deck Area | 396.2 sq m |
| Main Spans | 1 |
| Year Built | 1932 |
Traffic
| Avg Daily Traffic | 53,100 (2024) |
| Truck Traffic | 2% |
| Lanes On Bridge | 6 |
Inspection & Ownership
| Last Inspection | 924 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is on the National Register of Historic Places |
| Structure Number | N120052EHDOTNBI |