Mill Dam Road over Centerport Harbor
FairSuffolk County, New York · 0.5 MI N of Centerport · Structure no. 000000003300640
- Built
- 1936
- 89 years old, rebuilt 2004
- Condition
- Fair
- inspected June 2024
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete
- Length
- 66 ft
- 1 main span
- Daily traffic
- 2,035
- 2021 count
- Owner
- County
- County Highway Agency
About this bridge
Mill Dam Road over Centerport Harbor is a prestressed concrete box beam or girders - multiple carrying Mill Dam Road over Centerport Harbor in Suffolk County, New York. It was built in 1936 and reconstructed in 2004, so it is 89 years old, older than the New York average of 53 years.
The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 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 2,035 vehicles a day, roughly 1% of them trucks, projected to reach 2,849 by 2041. The structure is 66 ft (20.1 m) long and 37 ft wide. If it were closed, the detour would be 0.6 mi (1 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Mill Dam Road over Centerport Harbor built?
It was built in 1936, making it 89 years old in 2025. It was reconstructed in 2004.
What condition is Mill Dam Road over Centerport Harbor 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 June 2024.
How much traffic does Mill Dam Road over Centerport Harbor carry?
About 2,035 vehicles per day (2021 count), of which roughly 1% are trucks.
How long is Mill Dam Road over Centerport Harbor?
The structure is 66 ft (20.1 m) long with a longest span of 60 ft (18.3 m) and a deck 37 ft wide.
Who owns Mill Dam Road over Centerport Harbor?
It is owned by the County Highway Agency.