Interstate 684 SB over Tamarack Swamp
FairFairfield County, Connecticut · .46 MI North of N.Y. S.L. · Structure no. 03512
- Built
- 1968
- 57 years old, rebuilt 1991
- Condition
- Fair
- inspected March 2024
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete
- Length
- 1,496 ft
- 30 main spans
- Daily traffic
- 35,050
- 2019 count
- Owner
- State
- State Highway Agency
About this bridge
Interstate 684 SB over Tamarack Swamp is a prestressed concrete box beam or girders - multiple carrying Interstate 684 SB over Tamarack Swamp in Fairfield County, Connecticut. It was built in 1968 and reconstructed in 1991, so it is 57 years old, older than the Connecticut average of 56.7 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 35,050 vehicles a day, roughly 9% of them trucks, projected to reach 52,081 by 2039. The structure is 1,496 ft (456 m) long and 55 ft wide. If it were closed, the detour would be 3.7 mi (6 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Interstate 684 SB over Tamarack Swamp built?
It was built in 1968, making it 57 years old in 2025. It was reconstructed in 1991.
What condition is Interstate 684 SB over Tamarack Swamp 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 March 2024.
How much traffic does Interstate 684 SB over Tamarack Swamp carry?
About 35,050 vehicles per day (2019 count), of which roughly 9% are trucks.
How long is Interstate 684 SB over Tamarack Swamp?
The structure is 1,496 ft (456 m) long with a longest span of 50 ft (15.2 m) and a deck 55 ft wide.
Who owns Interstate 684 SB over Tamarack Swamp?
It is owned by the State Highway Agency.