US Bridges

County Road 21 over Br Kinderhook Crk

Fair

Columbia County, New York · 0.5 MI SE of Kinderhook · Structure no. 000000003342140

Built
1930
95 years old, rebuilt 2002
Condition
Fair
inspected November 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
56 ft
1 main span
Daily traffic
2,048
2021 count
Owner
County
County Highway Agency

About this bridge

County Road 21 over Br Kinderhook Crk is a prestressed concrete box beam or girders - multiple carrying County Road 21 over Br Kinderhook Crk in Columbia County, New York. It was built in 1930 and reconstructed in 2002, 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 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 2,048 vehicles a day, roughly 10% of them trucks, projected to reach 2,867 by 2041. The structure is 56 ft (17.1 m) long and 33 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

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CarriesCounty Road 21
CrossesBr Kinderhook Crk
Location0.5 MI SE of Kinderhook
RouteCounty Highway 0
CountyColumbia County
StateNew York
Coordinates42.3904, -73.69071
Functional classUrban Local

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 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 geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating92 US tons
Inventory rating55 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length56 ft (17.1 m)
Longest span52 ft (15.8 m)
Deck width33 ft (10.2 m)
Roadway width25 ft (7.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,048 (2021)
Projected traffic2,867 by 2041
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedDeck replacement with only incidental widening
Estimated improvement cost$1.6 million (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was County Road 21 over Br Kinderhook Crk built?

It was built in 1930, making it 95 years old in 2025. It was reconstructed in 2002.

What condition is County Road 21 over Br Kinderhook Crk 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 November 2023.

How much traffic does County Road 21 over Br Kinderhook Crk carry?

About 2,048 vehicles per day (2021 count), of which roughly 10% are trucks.

How long is County Road 21 over Br Kinderhook Crk?

The structure is 56 ft (17.1 m) long with a longest span of 52 ft (15.8 m) and a deck 33 ft wide.

Who owns County Road 21 over Br Kinderhook Crk?

It is owned by the County Highway Agency.