US Bridges

RTE 100 over New Croton Reservoir

Fair

Westchester County, New York · .2 MI S.Jct Rts 100 & 118 · Structure no. 000000001036140

Built
1989
36 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
605 ft
3 main spans
Daily traffic
8,020
2011 count
Owner
State
State Highway Agency

About this bridge

RTE 100 over New Croton Reservoir is a steel continuous stringer/multi-beam or girder carrying RTE 100 over New Croton Reservoir in Westchester County, New York. It was built in 1989, so it is 36 years old, younger 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 6 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 8,020 vehicles a day, roughly 4% of them trucks, projected to reach 9,742 by 2041. The structure is 605 ft (184.4 m) long and 54 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

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CarriesRTE 100
CrossesNew Croton Reservoir
Location.2 MI S.Jct Rts 100 & 118
RouteState Highway 100
CountyWestchester County
StateNew York
Coordinates41.22792, -73.76582
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating80 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length605 ft (184.4 m)
Longest span230 ft (70.1 m)
Deck width54 ft (16.5 m)
Roadway width52 ft (15.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,020 (2011)
Projected traffic9,742 by 2041
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 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$21.3 million (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was RTE 100 over New Croton Reservoir built?

It was built in 1989, making it 36 years old in 2025.

What condition is RTE 100 over New Croton Reservoir 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 June 2023.

How much traffic does RTE 100 over New Croton Reservoir carry?

About 8,020 vehicles per day (2011 count), of which roughly 4% are trucks.

How long is RTE 100 over New Croton Reservoir?

The structure is 605 ft (184.4 m) long with a longest span of 230 ft (70.1 m) and a deck 54 ft wide.

Who owns RTE 100 over New Croton Reservoir?

It is owned by the State Highway Agency.