I 93 Bt NB4-N Abt over I 93 Conn D & K
FairSuffolk County, Massachusetts · 1.9 KM N of JCT US1&I93 · Structure no. B162813BRDOTNBI
- Built
- 1970
- 55 years old
- Condition
- Fair
- inspected November 2023
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 370 ft
- 2 main spans
- Daily traffic
- 65,702
- 2022 count
- Owner
- State
- State Highway Agency
About this bridge
I 93 Bt NB4-N Abt over I 93 Conn D & K is a steel continuous stringer/multi-beam or girder carrying I 93 Bt NB4-N Abt over I 93 Conn D & K in Suffolk County, Massachusetts. It was built in 1970, so it is 55 years old, younger 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 65,702 vehicles a day, roughly 6% of them trucks, projected to reach 244,792 by 2032. The structure is 370 ft (112.8 m) long and 72 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 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 | 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 I 93 Bt NB4-N Abt over I 93 Conn D & K built?
It was built in 1970, making it 55 years old in 2025.
What condition is I 93 Bt NB4-N Abt over I 93 Conn D & K 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 November 2023.
How much traffic does I 93 Bt NB4-N Abt over I 93 Conn D & K carry?
About 65,702 vehicles per day (2022 count), of which roughly 6% are trucks.
How long is I 93 Bt NB4-N Abt over I 93 Conn D & K?
The structure is 370 ft (112.8 m) long with a longest span of 138 ft (42.1 m) and a deck 72 ft wide.
Who owns I 93 Bt NB4-N Abt over I 93 Conn D & K?
It is owned by the State Highway Agency.