US Bridges

Ramp to Hrp NB over Mamaroneck River

Poor

Westchester County, New York · NB on Ramp to Hrp Fr.Mama · Structure no. 000000005523439

Built
1987
38 years old
Condition
Poor
inspected March 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
104 ft
1 main span
Daily traffic
5,423
2020 count
Owner
State
State Highway Agency

About this bridge

Ramp to Hrp NB over Mamaroneck River is a steel stringer/multi-beam or girder carrying Ramp to Hrp NB 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 poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 5,423 vehicles a day, projected to reach 7,650 by 2041. The structure is 104 ft (31.7 m) long and 37 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesRamp to Hrp NB
CrossesMamaroneck River
LocationNB on Ramp to Hrp Fr.Mama
CountyWestchester County
StateNew York
Coordinates40.98406, -73.74042
Functional classUrban Principal Arterial - Other Freeway or Expressway

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
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 geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating103.9 US tons
Inventory rating61.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length104 ft (31.7 m)
Longest span102 ft (31 m)
Deck width37 ft (11.3 m)
Roadway width23 ft (7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,423 (2020)
Projected traffic7,650 by 2041
Trucks0%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway and pedestrian
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$3.7 million (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Ramp to Hrp NB over Mamaroneck River built?

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

What condition is Ramp to Hrp NB over Mamaroneck River in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in March 2024.

How much traffic does Ramp to Hrp NB over Mamaroneck River carry?

About 5,423 vehicles per day (2020 count).

How long is Ramp to Hrp NB over Mamaroneck River?

The structure is 104 ft (31.7 m) long with a longest span of 102 ft (31 m) and a deck 37 ft wide.

Who owns Ramp to Hrp NB over Mamaroneck River?

It is owned by the State Highway Agency.