US Bridges

Denning Road over Flat Brook

Fair

Ulster County, New York · In Denning · Structure no. 000000003370580

Built
1970
55 years old
Condition
Fair
inspected July 2024
Type
Culvert
Aluminum, Wrought Iron, or Cast Iron
Length
22 ft
1 main span
Daily traffic
277
2021 count
Owner
County
County Highway Agency

About this bridge

Denning Road over Flat Brook is a aluminum, wrought iron, or cast iron culvert carrying Denning Road over Flat Brook in Ulster County, New York. It was built in 1970, so it is 55 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 277 vehicles a day, roughly 7% of them trucks, projected to reach 388 by 2041. The structure is 22 ft (6.7 m) long. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesDenning Road
CrossesFlat Brook
LocationIn Denning
CountyUlster County
StateNew York
Coordinates41.96423, -74.45963
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
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating110.1 US tons
Inventory rating72 US tons

Structure

Structure typeCulvert
MaterialAluminum, Wrought Iron, or Cast Iron
DeckNot applicable
Main spans1
Design loadUnknown
Structure length22 ft (6.7 m)
Longest span21 ft (6.4 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic277 (2021)
Projected traffic388 by 2041
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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$164,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Denning Road over Flat Brook built?

It was built in 1970, making it 55 years old in 2025.

What condition is Denning Road over Flat Brook 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 July 2024.

How much traffic does Denning Road over Flat Brook carry?

About 277 vehicles per day (2021 count), of which roughly 7% are trucks.

How long is Denning Road over Flat Brook?

The structure is 22 ft (6.7 m) long with a longest span of 21 ft (6.4 m).

Who owns Denning Road over Flat Brook?

It is owned by the County Highway Agency.