US Bridges

Hrp Nbramp-Mam Av over Mamaroneck River

Fair

Westchester County, New York · Hrp NB Off Ramp to Mamaro · Structure no. 000000005523420

Built
1987
38 years old
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
70 ft
1 main span
Daily traffic
2,946
2020 count
Owner
State
State Highway Agency

About this bridge

Hrp Nbramp-Mam Av over Mamaroneck River is a steel stringer/multi-beam or girder carrying Hrp Nbramp-Mam Av 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 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 2,946 vehicles a day, roughly 15% of them trucks, projected to reach 4,155 by 2041. The structure is 70 ft (21.3 m) long and 27 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesHrp Nbramp-Mam Av
CrossesMamaroneck River
LocationHrp NB Off Ramp to Mamaro
CountyWestchester County
StateNew York
Coordinates40.98365, -73.74103
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating34 US tons
Inventory rating20 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length70 ft (21.3 m)
Longest span68 ft (20.7 m)
Deck width27 ft (8.3 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,946 (2020)
Projected traffic4,155 by 2041
Trucks15%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes

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$1.7 million (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Hrp Nbramp-Mam Av over Mamaroneck River built?

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

What condition is Hrp Nbramp-Mam Av 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 2024.

How much traffic does Hrp Nbramp-Mam Av over Mamaroneck River carry?

About 2,946 vehicles per day (2020 count), of which roughly 15% are trucks.

How long is Hrp Nbramp-Mam Av over Mamaroneck River?

The structure is 70 ft (21.3 m) long with a longest span of 68 ft (20.7 m) and a deck 27 ft wide.

Who owns Hrp Nbramp-Mam Av over Mamaroneck River?

It is owned by the State Highway Agency.