US Bridges

Montauk Highway over Lirr-Montauk Brch

FairPosted for load

Suffolk County, New York · .1 MI E JCT Rt 24&MTK HWY · Structure no. 000000003019560

Built
1934
91 years old
Condition
Fair
inspected July 2024
Type
Girder and Floorbeam System
Steel
Length
332 ft
5 main spans
Daily traffic
15,017
2018 count
Owner
County
County Highway Agency

About this bridge

Montauk Highway over Lirr-Montauk Brch is a steel girder and floorbeam system carrying Montauk Highway over Lirr-Montauk Brch in Suffolk County, New York. It was built in 1934, so it is 91 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. Its operating status is: posted for other load-capacity restriction.

It carries about 15,017 vehicles a day, roughly 6% of them trucks, projected to reach 18,242 by 2041. The structure is 332 ft (101.2 m) long and 50 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesMontauk Highway
CrossesLirr-Montauk Brch
Location.1 MI E JCT Rt 24&MTK HWY
CountySuffolk County
StateNew York
Coordinates40.88141, -72.51226
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 statusPosted for other load-capacity restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating64 US tons
Inventory rating38 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialSteel
DeckConcrete, cast-in-place
Main spans5
Design loadH 20
Structure length332 ft (101.2 m)
Longest span92 ft (28 m)
Deck width50 ft (15.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,017 (2018)
Projected traffic18,242 by 2041
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesRailroad
Detour if closed1.9 mi (3 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$11.6 million (2024 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Montauk Highway over Lirr-Montauk Brch built?

It was built in 1934, making it 91 years old in 2025.

What condition is Montauk Highway over Lirr-Montauk Brch 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 Montauk Highway over Lirr-Montauk Brch carry?

About 15,017 vehicles per day (2018 count), of which roughly 6% are trucks.

How long is Montauk Highway over Lirr-Montauk Brch?

The structure is 332 ft (101.2 m) long with a longest span of 92 ft (28 m) and a deck 50 ft wide.

Who owns Montauk Highway over Lirr-Montauk Brch?

It is owned by the County Highway Agency.