US Bridges

KY-80 over Rock Fork

FairPosted for load

Floyd County, Kentucky · 0.35 MI N of Knott CO Ln. · Structure no. 036B00103N

Built
1978
47 years old
Condition
Fair
inspected September 2024
Type
Culvert
Concrete
Length
38 ft
2 main spans
Daily traffic
4,654
2022 count
Owner
State
State Highway Agency

About this bridge

KY-80 over Rock Fork is a concrete culvert carrying KY-80 over Rock Fork in Floyd County, Kentucky. It was built in 1978, so it is 47 years old, older than the Kentucky average of 46.6 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. Its operating status is: posted for load restriction.

It carries about 4,654 vehicles a day, roughly 16% of them trucks, projected to reach 4,654 by 2042. The structure is 38 ft (11.5 m) long and 110 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesKY-80
CrossesRock Fork
Location0.35 MI N of Knott CO Ln.
RouteState Highway 80
CountyFloyd County
StateKentucky
Coordinates37.47444, -82.84889
Functional classRural Principal Arterial - Other

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 protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
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 rating43 US tons
Inventory rating20 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20
Structure length38 ft (11.5 m)
Longest span18 ft (5.6 m)
Deck width110 ft (33.6 m)
Roadway width41 ft (12.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,654 (2022)
Projected traffic4,654 by 2042
Trucks16%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was KY-80 over Rock Fork built?

It was built in 1978, making it 47 years old in 2025.

What condition is KY-80 over Rock Fork 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 September 2024.

How much traffic does KY-80 over Rock Fork carry?

About 4,654 vehicles per day (2022 count), of which roughly 16% are trucks.

How long is KY-80 over Rock Fork?

The structure is 38 ft (11.5 m) long with a longest span of 18 ft (5.6 m) and a deck 110 ft wide.

Who owns KY-80 over Rock Fork?

It is owned by the State Highway Agency.