US Bridges

Rock City Road over Stony Kill

Fair

Columbia County, New York · .9 MI West of East Chathm · Structure no. 000000003342190

Built
1985
40 years old
Condition
Fair
inspected May 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
92 ft
1 main span
Daily traffic
1,421
2020 count
Owner
County
County Highway Agency

About this bridge

Rock City Road over Stony Kill is a prestressed concrete box beam or girders - multiple carrying Rock City Road over Stony Kill in Columbia County, New York. It was built in 1985, so it is 40 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 1,421 vehicles a day, roughly 17% of them trucks, projected to reach 1,989 by 2040. The structure is 92 ft (28 m) long and 34 ft wide. If it were closed, the detour would be 2.5 mi (4 km).

Location

Open in Google Maps
CarriesRock City Road
CrossesStony Kill
Location.9 MI West of East Chathm
RouteCounty Highway 0
CountyColumbia County
StateNew York
Coordinates42.40604, -73.54008
Functional classRural 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.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating53 US tons
Inventory rating22 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckNot applicable
Main spans1
Design loadHS 20
Structure length92 ft (28 m)
Longest span90 ft (27.4 m)
Deck width34 ft (10.5 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,421 (2020)
Projected traffic1,989 by 2040
Trucks17%
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$1.4 million (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Rock City Road over Stony Kill built?

It was built in 1985, making it 40 years old in 2025.

What condition is Rock City Road over Stony 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 May 2023.

How much traffic does Rock City Road over Stony Kill carry?

About 1,421 vehicles per day (2020 count), of which roughly 17% are trucks.

How long is Rock City Road over Stony Kill?

The structure is 92 ft (28 m) long with a longest span of 90 ft (27.4 m) and a deck 34 ft wide.

Who owns Rock City Road over Stony Kill?

It is owned by the County Highway Agency.