US Bridges

Greenwich Road over Mianus River

Fair

Westchester County, New York · 4.6 MI East of Mt Kisco · Structure no. 000000003347940

Built
1919
106 years old
Condition
Fair
inspected April 2023
Type
Slab
Concrete
Length
27 ft
1 main span
Daily traffic
2,321
2021 count
Owner
County
County Highway Agency

About this bridge

Greenwich Road over Mianus River is a concrete slab carrying Greenwich Road over Mianus River in Westchester County, New York. It was built in 1919, so it is 106 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 2,321 vehicles a day, roughly 5% of them trucks, projected to reach 2,871 by 2041. The structure is 27 ft (8.2 m) long and 28 ft wide. If it were closed, the detour would be 2.5 mi (4 km).

Location

Open in Google Maps
CarriesGreenwich Road
CrossesMianus River
Location4.6 MI East of Mt Kisco
RouteCounty Highway 0
CountyWestchester County
StateNew York
Coordinates41.19525, -73.64331
Functional classUrban Collector

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 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
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 geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating58 US tons
Inventory rating33 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckNot applicable
Main spans1
Design loadUnknown
Structure length27 ft (8.2 m)
Longest span25 ft (7.6 m)
Deck width28 ft (8.5 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,321 (2021)
Projected traffic2,871 by 2041
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed2.5 mi (4 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$508,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Greenwich Road over Mianus River built?

It was built in 1919, making it 106 years old in 2025.

What condition is Greenwich Road over Mianus 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 Greenwich Road over Mianus River carry?

About 2,321 vehicles per day (2021 count), of which roughly 5% are trucks.

How long is Greenwich Road over Mianus River?

The structure is 27 ft (8.2 m) long with a longest span of 25 ft (7.6 m) and a deck 28 ft wide.

Who owns Greenwich Road over Mianus River?

It is owned by the County Highway Agency.