US Bridges

South Mountain Roa over Klyne Kill

Fair

Ulster County, New York · 1.9 MI NE of Dwaarkill · Structure no. 000000003347380

Built
1930
95 years old, rebuilt 1990
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
43 ft
1 main span
Daily traffic
204
2018 count
Owner
County
County Highway Agency

About this bridge

South Mountain Roa over Klyne Kill is a steel stringer/multi-beam or girder carrying South Mountain Roa over Klyne Kill in Ulster County, New York. It was built in 1930 and reconstructed in 1990, 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 204 vehicles a day, roughly 7% of them trucks, projected to reach 286 by 2038. The structure is 43 ft (13.1 m) long and 23 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesSouth Mountain Roa
CrossesKlyne Kill
Location1.9 MI NE of Dwaarkill
CountyUlster County
StateNew York
Coordinates41.67094, -74.24288
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating55 US tons
Inventory rating40 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckWood or timber
Main spans1
Design loadUnknown
Structure length43 ft (13.1 m)
Longest span40 ft (12.1 m)
Deck width23 ft (7 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic204 (2018)
Projected traffic286 by 2038
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
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 statusNot eligible for the National Register of Historic Places
Work proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$1 million (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was South Mountain Roa over Klyne Kill built?

It was built in 1930, making it 95 years old in 2025. It was reconstructed in 1990.

What condition is South Mountain Roa over Klyne 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 South Mountain Roa over Klyne Kill carry?

About 204 vehicles per day (2018 count), of which roughly 7% are trucks.

How long is South Mountain Roa over Klyne Kill?

The structure is 43 ft (13.1 m) long with a longest span of 40 ft (12.1 m) and a deck 23 ft wide.

Who owns South Mountain Roa over Klyne Kill?

It is owned by the County Highway Agency.