ST 9 Boylston ST over TR Green Line D
PoorMiddlesex County, Massachusetts · 2.3 KM Ely Rt 128 · Structure no. N120402EEDOTNBI
- Built
- 1905
- 120 years old, rebuilt 1960
- Condition
- Poor
- inspected December 2022
- Type
- Girder and Floorbeam System
- Steel
- Length
- 56 ft
- 1 main span
- Daily traffic
- 96,206
- 2017 count
- Owner
- State
- State Highway Agency
About this bridge
ST 9 Boylston ST over TR Green Line D is a steel girder and floorbeam system carrying ST 9 Boylston ST over TR Green Line D in Middlesex County, Massachusetts. It was built in 1905 and reconstructed in 1960, so it is 120 years old, older than the Massachusetts average of 63.8 years.
The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
It carries about 96,206 vehicles a day, roughly 4% of them trucks, projected to reach 136,609 by 2032. The structure is 56 ft (17.1 m) long and 90 ft wide. If it were closed, the detour would be 1.2 mi (2 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was ST 9 Boylston ST over TR Green Line D built?
It was built in 1905, making it 120 years old in 2025. It was reconstructed in 1960.
What condition is ST 9 Boylston ST over TR Green Line D in?
The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in December 2022.
How much traffic does ST 9 Boylston ST over TR Green Line D carry?
About 96,206 vehicles per day (2017 count), of which roughly 4% are trucks.
How long is ST 9 Boylston ST over TR Green Line D?
The structure is 56 ft (17.1 m) long with a longest span of 50 ft (15.2 m) and a deck 90 ft wide.
Who owns ST 9 Boylston ST over TR Green Line D?
It is owned by the State Highway Agency.