US Bridges

Tompkins Ave over Mamaroneck River

PoorClosed to traffic

Westchester County, New York · At Mamaroneck · Structure no. 000000002225120

Built
1900
125 years old
Condition
Poor
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
39 ft
1 main span
Daily traffic
3,122
2016 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

Tompkins Ave over Mamaroneck River is a steel stringer/multi-beam or girder carrying Tompkins Ave over Mamaroneck River in Westchester County, New York. It was built in 1900, so it is 125 years old, older 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 3 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. Its operating status is: closed to all traffic.

It carries about 3,122 vehicles a day, roughly 5% of them trucks, projected to reach 4,371 by 2036. The structure is 39 ft (11.9 m) long and 51 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

CarriesTompkins Ave
CrossesMamaroneck River
LocationAt Mamaroneck
Coordinates40.95083, -73.73233
Functional classUrban Local

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
Deck3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionJuly 2024
Inspection intervalevery 12 months
Operating statusClosed to all traffic
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation0: Immediate repair necessary to put back in service
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating0 US tons
Inventory rating0 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length39 ft (11.9 m)
Longest span37 ft (11.3 m)
Deck width51 ft (15.5 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,122 (2016)
Projected traffic4,371 by 2036
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerTown or Township Highway Agency
Maintained byTown or Township Highway Agency
Historic statusEligible for the National Register of Historic Places
Work proposedDeck replacement with only incidental widening
Estimated improvement cost$2.7 million (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Tompkins Ave over Mamaroneck River built?

It was built in 1900, making it 125 years old in 2025.

What condition is Tompkins Ave 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 July 2024.

How much traffic does Tompkins Ave over Mamaroneck River carry?

About 3,122 vehicles per day (2016 count), of which roughly 5% are trucks.

How long is Tompkins Ave over Mamaroneck River?

The structure is 39 ft (11.9 m) long with a longest span of 37 ft (11.3 m) and a deck 51 ft wide.

Who owns Tompkins Ave over Mamaroneck River?

It is owned by the Town or Township Highway Agency.