US Bridges

RTE 100 over Plum Brook

Fair

Westchester County, New York · 1 MI S JCT SH 100 & US202 · Structure no. 000000001036160

Built
1949
76 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
92 ft
1 main span
Daily traffic
7,608
2017 count
Owner
State
State Highway Agency

About this bridge

RTE 100 over Plum Brook is a steel stringer/multi-beam or girder carrying RTE 100 over Plum Brook in Westchester County, New York. It was built in 1949, so it is 76 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 7,608 vehicles a day, roughly 7% of them trucks, projected to reach 9,242 by 2041. The structure is 92 ft (28 m) long and 56 ft wide. If it were closed, the detour would be 7.5 mi (12 km).

Location

Open in Google Maps
CarriesRTE 100
CrossesPlum Brook
Location1 MI S JCT SH 100 & US202
RouteState Highway 100
CountyWestchester County
StateNew York
Coordinates41.30436, -73.69805
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating58 US tons
Inventory rating34 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length92 ft (28 m)
Longest span90 ft (27.4 m)
Deck width56 ft (17 m)
Roadway width48 ft (14.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,608 (2017)
Projected traffic9,242 by 2041
Trucks7%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed7.5 mi (12 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$3.2 million (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was RTE 100 over Plum Brook built?

It was built in 1949, making it 76 years old in 2025.

What condition is RTE 100 over Plum 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 August 2024.

How much traffic does RTE 100 over Plum Brook carry?

About 7,608 vehicles per day (2017 count), of which roughly 7% are trucks.

How long is RTE 100 over Plum Brook?

The structure is 92 ft (28 m) long with a longest span of 90 ft (27.4 m) and a deck 56 ft wide.

Who owns RTE 100 over Plum Brook?

It is owned by the State Highway Agency.