US Bridges

RTE 987D over Catskill Aqueduct

Fair

Westchester County, New York · 1.0 MI S of Chappaqua · Structure no. 000000005524360

Built
1930
95 years old
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
81 ft
3 main spans
Daily traffic
28,879
2021 count
Owner
State
State Highway Agency

About this bridge

RTE 987D over Catskill Aqueduct is a steel stringer/multi-beam or girder carrying RTE 987D over Catskill Aqueduct in Westchester County, New York. It was built in 1930, so it is 95 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 28,879 vehicles a day, roughly 1% of them trucks, projected to reach 40,739 by 2041. The structure is 81 ft (24.7 m) long and 48 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesRTE 987D
CrossesCatskill Aqueduct
Location1.0 MI S of Chappaqua
CountyWestchester County
StateNew York
Coordinates41.147, -73.78573
Functional classUrban Principal Arterial - Other Freeway or Expressway

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.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment6: Equal to present minimum criteria
Operating rating55 US tons
Inventory rating33 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadUnknown
Structure length81 ft (24.7 m)
Longest span28 ft (8.5 m)
Deck width48 ft (14.5 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic28,879 (2021)
Projected traffic40,739 by 2041
Trucks1%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesOther
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedDeck replacement with only incidental widening
Estimated improvement cost$3 million (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was RTE 987D over Catskill Aqueduct built?

It was built in 1930, making it 95 years old in 2025.

What condition is RTE 987D over Catskill Aqueduct 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 987D over Catskill Aqueduct carry?

About 28,879 vehicles per day (2021 count), of which roughly 1% are trucks.

How long is RTE 987D over Catskill Aqueduct?

The structure is 81 ft (24.7 m) long with a longest span of 28 ft (8.5 m) and a deck 48 ft wide.

Who owns RTE 987D over Catskill Aqueduct?

It is owned by the State Highway Agency.