US Bridges

RTE 27A over Carlls River

Fair

Suffolk County, New York · RTE 27A-.6MI W RTE 231 · Structure no. 000000001019460

Built
1937
88 years old
Condition
Fair
inspected May 2024
Type
Slab
Concrete
Length
28 ft
1 main span
Daily traffic
27,434
2020 count
Owner
State
State Highway Agency

About this bridge

RTE 27A over Carlls River is a concrete slab carrying RTE 27A over Carlls River in Suffolk County, New York. It was built in 1937, so it is 88 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 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 27,434 vehicles a day, roughly 3% of them trucks, projected to reach 33,326 by 2041. The structure is 28 ft (8.5 m) long and 75 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesRTE 27A
CrossesCarlls River
LocationRTE 27A-.6MI W RTE 231
RouteState Highway 27A
CountySuffolk County
StateNew York
Coordinates40.69495, -73.32865
Functional classUrban Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating73 US tons
Inventory rating44 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckNot applicable
Main spans1
Design loadUnknown
Structure length28 ft (8.5 m)
Longest span27 ft (8.2 m)
Deck width75 ft (22.9 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic27,434 (2020)
Projected traffic33,326 by 2041
Trucks3%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$2 million (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was RTE 27A over Carlls River built?

It was built in 1937, making it 88 years old in 2025.

What condition is RTE 27A over Carlls River 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 May 2024.

How much traffic does RTE 27A over Carlls River carry?

About 27,434 vehicles per day (2020 count), of which roughly 3% are trucks.

How long is RTE 27A over Carlls River?

The structure is 28 ft (8.5 m) long with a longest span of 27 ft (8.2 m) and a deck 75 ft wide.

Who owns RTE 27A over Carlls River?

It is owned by the State Highway Agency.