US Bridges

County Road 29 over Demarest Kill

Fair

Rockland County, New York · In Clarkstown · Structure no. 000000003367950

Built
1988
37 years old
Condition
Fair
inspected March 2023
Type
Culvert
Concrete
Length
55 ft
3 main spans
Daily traffic
2,153
2015 count
Owner
County
County Highway Agency

About this bridge

County Road 29 over Demarest Kill is a concrete culvert carrying County Road 29 over Demarest Kill in Rockland County, New York. It was built in 1988, so it is 37 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 2,153 vehicles a day, roughly 5% of them trucks, projected to reach 2,615 by 2041. The structure is 55 ft (16.8 m) long and 38 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesCounty Road 29
CrossesDemarest Kill
LocationIn Clarkstown
RouteCounty Highway 0
CountyRockland County
StateNew York
Coordinates41.16944, -73.97904
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57.1 US tons
Inventory rating44.3 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHS 20
Structure length55 ft (16.8 m)
Longest span16 ft (4.8 m)
Deck width38 ft (11.7 m)
Roadway width30 ft (9.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,153 (2015)
Projected traffic2,615 by 2041
Trucks5%
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

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$1.7 million (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was County Road 29 over Demarest Kill built?

It was built in 1988, making it 37 years old in 2025.

What condition is County Road 29 over Demarest Kill 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 2023.

How much traffic does County Road 29 over Demarest Kill carry?

About 2,153 vehicles per day (2015 count), of which roughly 5% are trucks.

How long is County Road 29 over Demarest Kill?

The structure is 55 ft (16.8 m) long with a longest span of 16 ft (4.8 m) and a deck 38 ft wide.

Who owns County Road 29 over Demarest Kill?

It is owned by the County Highway Agency.