US Bridges

KY-18 over Trib.Of Allen Fork

Fair

Boone County, Kentucky · 1.8 Mi.W.Jct Ky 338 · Structure no. 008B00062N

Built
1982
43 years old
Condition
Fair
inspected June 2023
Type
Culvert
Concrete
Length
32 ft
1 main span
Daily traffic
1,907
2023 count
Owner
State
State Highway Agency

About this bridge

KY-18 over Trib.Of Allen Fork is a concrete culvert carrying KY-18 over Trib.Of Allen Fork in Boone County, Kentucky. It was built in 1982, so it is 43 years old, younger 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.

It carries about 1,907 vehicles a day, roughly 22% of them trucks, projected to reach 1,907 by 2043. The structure is 32 ft (9.8 m) long. If it were closed, the detour would be 14.3 mi (23 km).

Location

Open in Google Maps
CarriesKY-18
CrossesTrib.Of Allen Fork
Location1.8 Mi.W.Jct Ky 338
RouteState Highway 18
CountyBoone County
StateKentucky
Coordinates39.02306, -84.75167
Functional classUrban Collector

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 inspectionJune 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating81 US tons
Inventory rating48.6 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHS 20
Structure length32 ft (9.8 m)
Longest span32 ft (9.8 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,907 (2023)
Projected traffic1,907 by 2043
Trucks22%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.3 mi (23 km)
TollOn a free road
National Highway SystemNo

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-18 over Trib.Of Allen Fork built?

It was built in 1982, making it 43 years old in 2025.

What condition is KY-18 over Trib.Of Allen 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 June 2023.

How much traffic does KY-18 over Trib.Of Allen Fork carry?

About 1,907 vehicles per day (2023 count), of which roughly 22% are trucks.

How long is KY-18 over Trib.Of Allen Fork?

The structure is 32 ft (9.8 m) long with a longest span of 32 ft (9.8 m).

Who owns KY-18 over Trib.Of Allen Fork?

It is owned by the State Highway Agency.