US Bridges

Harlemville Road over Gnat Creek

Fair

Columbia County, New York · 1.7 MI SE of Ghent · Structure no. 000000003222580

Built
1938
87 years old, rebuilt 2017
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
35 ft
1 main span
Daily traffic
936
2020 count
Owner
County
County Highway Agency

About this bridge

Harlemville Road over Gnat Creek is a steel stringer/multi-beam or girder carrying Harlemville Road over Gnat Creek in Columbia County, New York. It was built in 1938 and reconstructed in 2017, so it is 87 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 936 vehicles a day, roughly 5% of them trucks, projected to reach 1,310 by 2040. The structure is 35 ft (10.7 m) long and 31 ft wide. If it were closed, the detour would be 2.5 mi (4 km).

Location

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CarriesHarlemville Road
CrossesGnat Creek
Location1.7 MI SE of Ghent
CountyColumbia County
StateNew York
Coordinates42.30648, -73.60228
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
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 protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionOctober 2024
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 geometry6: Equal to present minimum criteria
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating48 US tons
Inventory rating29 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+1 approach)
Design loadH 15
Structure length35 ft (10.7 m)
Longest span19 ft (5.7 m)
Deck width31 ft (9.6 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic936 (2020)
Projected traffic1,310 by 2040
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$974,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Harlemville Road over Gnat Creek built?

It was built in 1938, making it 87 years old in 2025. It was reconstructed in 2017.

What condition is Harlemville Road over Gnat Creek 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 October 2024.

How much traffic does Harlemville Road over Gnat Creek carry?

About 936 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is Harlemville Road over Gnat Creek?

The structure is 35 ft (10.7 m) long with a longest span of 19 ft (5.7 m) and a deck 31 ft wide.

Who owns Harlemville Road over Gnat Creek?

It is owned by the County Highway Agency.