I 95 NB/ST128 NB over ST 3 A/Cambridge ST
FairMiddlesex County, Massachusetts · At Junc. of I 95 & ST 3A · Structure no. B290102EUDOTNBI
- Built
- 1950
- 75 years old, rebuilt 1964
- Condition
- Fair
- inspected August 2023
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 205 ft
- 3 main spans
- Daily traffic
- 89,900
- 2019 count
- Owner
- State
- State Highway Agency
About this bridge
I 95 NB/ST128 NB over ST 3 A/Cambridge ST is a steel stringer/multi-beam or girder carrying I 95 NB/ST128 NB over ST 3 A/Cambridge ST in Middlesex County, Massachusetts. It was built in 1950 and reconstructed in 1964, so it is 75 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 89,900 vehicles a day, roughly 10% of them trucks, projected to reach 252,530 by 2032. The structure is 205 ft (62.5 m) long and 74 ft wide. If it were closed, the detour would be 4.3 mi (7 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| 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. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I 95 NB/ST128 NB over ST 3 A/Cambridge ST built?
It was built in 1950, making it 75 years old in 2025. It was reconstructed in 1964.
What condition is I 95 NB/ST128 NB over ST 3 A/Cambridge ST 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 August 2023.
How much traffic does I 95 NB/ST128 NB over ST 3 A/Cambridge ST carry?
About 89,900 vehicles per day (2019 count), of which roughly 10% are trucks.
How long is I 95 NB/ST128 NB over ST 3 A/Cambridge ST?
The structure is 205 ft (62.5 m) long with a longest span of 105 ft (32 m) and a deck 74 ft wide.
Who owns I 95 NB/ST128 NB over ST 3 A/Cambridge ST?
It is owned by the State Highway Agency.