US Bridges

RTE I495 over Round Swamp Road

Fair

Suffolk County, New York · 1.8 MI SE JCT MSP+I495 · Structure no. 000000001049281

Built
1997
28 years old
Condition
Fair
inspected September 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
159 ft
3 main spans
Daily traffic
85,517
2014 count
Owner
State
State Highway Agency

About this bridge

RTE I495 over Round Swamp Road is a prestressed concrete box beam or girders - multiple carrying RTE I495 over Round Swamp Road in Suffolk County, New York. It was built in 1997, so it is 28 years old, younger 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 85,517 vehicles a day, roughly 13% of them trucks. The structure is 159 ft (48.5 m) long and 91 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

CarriesRTE I495
CrossesRound Swamp Road
Location1.8 MI SE JCT MSP+I495
RouteInterstate 495
Coordinates40.78541, -73.44457
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating66 US tons

Structure

MaterialPrestressed Concrete
DeckNot applicable
Main spans3
Design loadHS 25 or greater
Structure length159 ft (48.5 m)
Longest span87 ft (26.5 m)
Deck width91 ft (27.6 m)
Roadway width87 ft (26.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic85,517 (2014)
Projected traffic—
Trucks13%
Lanes on structure5
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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$7.6 million (2024 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was RTE I495 over Round Swamp Road built?

It was built in 1997, making it 28 years old in 2025.

What condition is RTE I495 over Round Swamp Road 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 I495 over Round Swamp Road carry?

About 85,517 vehicles per day (2014 count), of which roughly 13% are trucks.

How long is RTE I495 over Round Swamp Road?

The structure is 159 ft (48.5 m) long with a longest span of 87 ft (26.5 m) and a deck 91 ft wide.

Who owns RTE I495 over Round Swamp Road?

It is owned by the State Highway Agency.