US Bridges

Sills Road over LIRR Main Line

Fair

Suffolk County, New York · 1.5 MI W of Yaphank · Structure no. 000000003364521

Built
1976
49 years old
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
320 ft
5 main spans
Daily traffic
10,910
2020 count
Owner
County
County Highway Agency

About this bridge

Sills Road over LIRR Main Line is a steel stringer/multi-beam or girder carrying Sills Road over LIRR Main Line in Suffolk County, New York. It was built in 1976, so it is 49 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 10,910 vehicles a day, roughly 16% of them trucks, projected to reach 13,253 by 2041. The structure is 320 ft (97.5 m) long and 31 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesSills Road
CrossesLIRR Main Line
Location1.5 MI W of Yaphank
RouteCounty Highway 0
CountySuffolk County
StateNew York
Coordinates40.82219, -72.94277
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating98 US tons
Inventory rating58 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length320 ft (97.5 m)
Longest span75 ft (22.8 m)
Deck width31 ft (9.4 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,910 (2020)
Projected traffic13,253 by 2041
Trucks16%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesRailroad
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemNo

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$7 million (2024 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Sills Road over LIRR Main Line built?

It was built in 1976, making it 49 years old in 2025.

What condition is Sills Road 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 July 2024.

How much traffic does Sills Road over LIRR Main Line carry?

About 10,910 vehicles per day (2020 count), of which roughly 16% are trucks.

How long is Sills Road over LIRR Main Line?

The structure is 320 ft (97.5 m) long with a longest span of 75 ft (22.8 m) and a deck 31 ft wide.

Who owns Sills Road over LIRR Main Line?

It is owned by the County Highway Agency.