US Bridges

Mahopac Avenue over Muscoot River

Fair

Westchester County, New York · 3 Miles North of Amawalk · Structure no. 000000003364860

Built
1960
65 years old
Condition
Fair
inspected April 2023
Type
Slab
Concrete
Length
25 ft
1 main span
Daily traffic
2,991
2018 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

Mahopac Avenue over Muscoot River is a concrete slab carrying Mahopac Avenue over Muscoot River in Westchester County, New York. It was built in 1960, so it is 65 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 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 2,991 vehicles a day, roughly 4% of them trucks, projected to reach 3,633 by 2041. The structure is 25 ft (7.6 m) long and 30 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesMahopac Avenue
CrossesMuscoot River
Location3 Miles North of Amawalk
CountyWestchester County
StateNew York
Coordinates41.33275, -73.76489
Functional classUrban Minor 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
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating85.6 US tons
Inventory rating36 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckNot applicable
Main spans1
Design loadUnknown
Structure length25 ft (7.6 m)
Longest span24 ft (7.3 m)
Deck width30 ft (9.1 m)
Roadway width26 ft (8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,991 (2018)
Projected traffic3,633 by 2041
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerTown or Township Highway Agency
Maintained byTown or Township Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$606,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Mahopac Avenue over Muscoot River built?

It was built in 1960, making it 65 years old in 2025.

What condition is Mahopac Avenue over Muscoot 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 April 2023.

How much traffic does Mahopac Avenue over Muscoot River carry?

About 2,991 vehicles per day (2018 count), of which roughly 4% are trucks.

How long is Mahopac Avenue over Muscoot River?

The structure is 25 ft (7.6 m) long with a longest span of 24 ft (7.3 m) and a deck 30 ft wide.

Who owns Mahopac Avenue over Muscoot River?

It is owned by the Town or Township Highway Agency.