US Bridges

RTE 908G over Round Swamp Road

Fair

Suffolk County, New York · 1.9 MI E JCT RTE 495+NSP · Structure no. 000000001058309

Built
1947
78 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
48 ft
1 main span
Daily traffic
72,448
2018 count
Owner
State
State Highway Agency

About this bridge

RTE 908G over Round Swamp Road is a steel stringer/multi-beam or girder carrying RTE 908G over Round Swamp Road in Suffolk County, New York. It was built in 1947, so it is 78 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 72,448 vehicles a day, projected to reach 86,176 by 2041. The structure is 48 ft (14.6 m) long and 72 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesRTE 908G
CrossesRound Swamp Road
Location1.9 MI E JCT RTE 495+NSP
RouteState Highway 908G
CountySuffolk County
StateNew York
Coordinates40.80205, -73.44169
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment8: Equal to present desirable criteria
Operating rating43.5 US tons
Inventory rating33.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length48 ft (14.6 m)
Longest span46 ft (14 m)
Deck width72 ft (21.8 m)
Roadway width56 ft (17.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic72,448 (2018)
Projected traffic86,176 by 2041
Trucks0%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemYes

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$5.3 million (2024 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was RTE 908G over Round Swamp Road built?

It was built in 1947, making it 78 years old in 2025.

What condition is RTE 908G 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 August 2023.

How much traffic does RTE 908G over Round Swamp Road carry?

About 72,448 vehicles per day (2018 count).

How long is RTE 908G over Round Swamp Road?

The structure is 48 ft (14.6 m) long with a longest span of 46 ft (14 m) and a deck 72 ft wide.

Who owns RTE 908G over Round Swamp Road?

It is owned by the State Highway Agency.