US Bridges

RTE 100B over Manhattan Brook

Fair

Westchester County, New York · 0.1 MI W JCT Rts 100B+119 · Structure no. 000000001036220

Built
1932
93 years old
Condition
Fair
inspected March 2024
Type
Slab
Concrete
Length
27 ft
1 main span
Daily traffic
9,182
2019 count
Owner
State
State Highway Agency

About this bridge

RTE 100B over Manhattan Brook is a concrete slab carrying RTE 100B over Manhattan Brook in Westchester County, New York. It was built in 1932, so it is 93 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 9,182 vehicles a day, roughly 3% of them trucks, projected to reach 11,154 by 2041. The structure is 27 ft (8.2 m) long and 46 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesRTE 100B
CrossesManhattan Brook
Location0.1 MI W JCT Rts 100B+119
RouteState Highway 100B
CountyWestchester County
StateNew York
Coordinates41.04127, -73.79508
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 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 evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating68 US tons
Inventory rating41 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHS 20
Structure length27 ft (8.2 m)
Longest span24 ft (7.3 m)
Deck width46 ft (14.1 m)
Roadway width35 ft (10.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,182 (2019)
Projected traffic11,154 by 2041
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

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 million (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was RTE 100B over Manhattan Brook built?

It was built in 1932, making it 93 years old in 2025.

What condition is RTE 100B over Manhattan Brook 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 RTE 100B over Manhattan Brook carry?

About 9,182 vehicles per day (2019 count), of which roughly 3% are trucks.

How long is RTE 100B over Manhattan Brook?

The structure is 27 ft (8.2 m) long with a longest span of 24 ft (7.3 m) and a deck 46 ft wide.

Who owns RTE 100B over Manhattan Brook?

It is owned by the State Highway Agency.