US Bridges

Mamaroneck Avenue over Mamaroneck River

Fair

Westchester County, New York · Mamaroneck Ave-White Pl · Structure no. 000000005523399

Built
1987
38 years old
Condition
Fair
inspected March 2023
Type
Culvert
Concrete
Length
45 ft
2 main spans
Daily traffic
26,213
2020 count
Owner
County
County Highway Agency

About this bridge

Mamaroneck Avenue over Mamaroneck River is a concrete culvert carrying Mamaroneck Avenue over Mamaroneck River in Westchester County, New York. It was built in 1987, so it is 38 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 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 26,213 vehicles a day, roughly 3% of them trucks, projected to reach 26,336 by 2041. The structure is 45 ft (13.7 m) long. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesMamaroneck Avenue
CrossesMamaroneck River
LocationMamaroneck Ave-White Pl
RouteCity Street 0
CountyWestchester County
StateNew York
Coordinates40.98291, -73.74408
Functional classUrban Other Principal 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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating84.8 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20
Structure length45 ft (13.7 m)
Longest span20 ft (6 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deck107 ft (32.7 m)

Traffic and service

Average daily traffic26,213 (2020)
Projected traffic26,336 by 2041
Trucks3%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 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$1.7 million (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Mamaroneck Avenue over Mamaroneck River built?

It was built in 1987, making it 38 years old in 2025.

What condition is Mamaroneck Avenue 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 March 2023.

How much traffic does Mamaroneck Avenue over Mamaroneck River carry?

About 26,213 vehicles per day (2020 count), of which roughly 3% are trucks.

How long is Mamaroneck Avenue over Mamaroneck River?

The structure is 45 ft (13.7 m) long with a longest span of 20 ft (6 m).

Who owns Mamaroneck Avenue over Mamaroneck River?

It is owned by the County Highway Agency.