US Bridges

RTE 27 over Carmans River

Fair

Suffolk County, New York · 6.5 MI E JCT Rts 27+112 · Structure no. 000000001019322

Built
1959
66 years old
Condition
Fair
inspected September 2023
Type
Culvert
Concrete Continuous
Length
36 ft
2 main spans
Daily traffic
27,967
2019 count
Owner
State
State Highway Agency

About this bridge

RTE 27 over Carmans River is a concrete continuous culvert carrying RTE 27 over Carmans River in Suffolk County, New York. It was built in 1959, so it is 66 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 27,967 vehicles a day, roughly 5% of them trucks, projected to reach 33,266 by 2041. The structure is 36 ft (11 m) long. If it were closed, the detour would be 0.6 mi (1 km).

Location

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CarriesRTE 27
CrossesCarmans River
Location6.5 MI E JCT Rts 27+112
RouteState Highway 27
CountySuffolk County
StateNew York
Coordinates40.80236, -72.88534
Functional classUrban Principal Arterial - Other Freeway or Expressway

Condition and inspection

Fair

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

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating51.8 US tons
Inventory rating39.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20
Structure length36 ft (11 m)
Longest span17 ft (5.1 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic27,967 (2019)
Projected traffic33,266 by 2041
Trucks5%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$2.9 million (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was RTE 27 over Carmans River built?

It was built in 1959, making it 66 years old in 2025.

What condition is RTE 27 over Carmans 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 September 2023.

How much traffic does RTE 27 over Carmans River carry?

About 27,967 vehicles per day (2019 count), of which roughly 5% are trucks.

How long is RTE 27 over Carmans River?

The structure is 36 ft (11 m) long with a longest span of 17 ft (5.1 m).

Who owns RTE 27 over Carmans River?

It is owned by the State Highway Agency.