US Bridges

RTE I287 over Mamaroneck River

Fair

Westchester County, New York · 1.9 MI W JCT Rts I287+HRP · Structure no. 000000001044779

Built
1961
64 years old
Condition
Fair
inspected November 2024
Type
Culvert
Concrete Continuous
Length
42 ft
2 main spans
Daily traffic
104,391
2021 count
Owner
State
State Highway Agency

About this bridge

RTE I287 over Mamaroneck River is a concrete continuous culvert carrying RTE I287 over Mamaroneck River in Westchester County, New York. It was built in 1961, so it is 64 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 104,391 vehicles a day, roughly 15% of them trucks, projected to reach 176,775 by 2041. The structure is 42 ft (12.8 m) long. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesRTE I287
CrossesMamaroneck River
Location1.9 MI W JCT Rts I287+HRP
RouteInterstate 287
CountyWestchester County
StateNew York
Coordinates41.03033, -73.74219
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating58 US tons
Inventory rating35.1 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 25 or greater
Structure length42 ft (12.8 m)
Longest span18 ft (5.4 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic104,391 (2021)
Projected traffic176,775 by 2041
Trucks15%
Lanes on structure8
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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$2.9 million (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was RTE I287 over Mamaroneck River built?

It was built in 1961, making it 64 years old in 2025.

What condition is RTE I287 over Mamaroneck River 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 November 2024.

How much traffic does RTE I287 over Mamaroneck River carry?

About 104,391 vehicles per day (2021 count), of which roughly 15% are trucks.

How long is RTE I287 over Mamaroneck River?

The structure is 42 ft (12.8 m) long with a longest span of 18 ft (5.4 m).

Who owns RTE I287 over Mamaroneck River?

It is owned by the State Highway Agency.