ST 3 Cambridge ST over Comb ST3/ST28 & Charles
FairSuffolk County, Massachusetts · .2 MI W of Blossom ST · Structure no. B160094F0DOTNBI
- Built
- 1905
- 120 years old, rebuilt 2018
- Condition
- Fair
- inspected September 2024
- Type
- Arch - Deck
- Steel
- Length
- 2,135 ft
- 11 main spans
- Daily traffic
- 29,100
- 2018 count
- Owner
- State
- State Highway Agency
About this bridge
ST 3 Cambridge ST over Comb ST3/ST28 & Charles is a steel arch - deck carrying ST 3 Cambridge ST over Comb ST3/ST28 & Charles in Suffolk County, Massachusetts. It was built in 1905 and reconstructed in 2018, 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 fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
It carries about 29,100 vehicles a day, roughly 5% of them trucks, projected to reach 35,692 by 2031. The structure is 2,135 ft (650.7 m) long and 107 ft wide. If it were closed, the detour would be 1.9 mi (3 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was ST 3 Cambridge ST over Comb ST3/ST28 & Charles built?
It was built in 1905, making it 120 years old in 2025. It was reconstructed in 2018.
What condition is ST 3 Cambridge ST over Comb ST3/ST28 & Charles in?
The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in September 2024.
How much traffic does ST 3 Cambridge ST over Comb ST3/ST28 & Charles carry?
About 29,100 vehicles per day (2018 count), of which roughly 5% are trucks.
How long is ST 3 Cambridge ST over Comb ST3/ST28 & Charles?
The structure is 2,135 ft (650.7 m) long with a longest span of 243 ft (74.1 m) and a deck 107 ft wide.
Who owns ST 3 Cambridge ST over Comb ST3/ST28 & Charles?
It is owned by the State Highway Agency.