US Bridges

William Floyd Pky over LIRR Main Line

Fair

Suffolk County, New York · 1.8 MI East of Yaphank · Structure no. 000000003300789

Built
1960
65 years old
Condition
Fair
inspected June 2024
Type
Tee Beam
Concrete Continuous
Length
169 ft
3 main spans
Daily traffic
38,065
2021 count
Owner
County
County Highway Agency

About this bridge

William Floyd Pky over LIRR Main Line is a concrete continuous tee beam carrying William Floyd Pky over LIRR Main Line in Suffolk County, New York. It was built in 1960, so it is 65 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 38,065 vehicles a day, roughly 4% of them trucks, projected to reach 45,278 by 2041. The structure is 169 ft (51.5 m) long and 70 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesWilliam Floyd Pky
CrossesLIRR Main Line
Location1.8 MI East of Yaphank
RouteCounty Highway 0
CountySuffolk County
StateNew York
Coordinates40.83875, -72.88729
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
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.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48 US tons
Inventory rating28 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadOther
Structure length169 ft (51.5 m)
Longest span67 ft (20.4 m)
Deck width70 ft (21.3 m)
Roadway width56 ft (17.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic38,065 (2021)
Projected traffic45,278 by 2041
Trucks4%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesRailroad
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$6.1 million (2024 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was William Floyd Pky over LIRR Main Line built?

It was built in 1960, making it 65 years old in 2025.

What condition is William Floyd Pky over LIRR Main Line 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 William Floyd Pky over LIRR Main Line carry?

About 38,065 vehicles per day (2021 count), of which roughly 4% are trucks.

How long is William Floyd Pky over LIRR Main Line?

The structure is 169 ft (51.5 m) long with a longest span of 67 ft (20.4 m) and a deck 70 ft wide.

Who owns William Floyd Pky over LIRR Main Line?

It is owned by the County Highway Agency.