US Bridges

KY-81 over Slough

Fair

McLean County, Kentucky · .60 MI S of JCT Ky 85 · Structure no. 075B00080N

Built
2020
5 years old
Condition
Fair
inspected August 2024
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete
Length
33 ft
1 main span
Daily traffic
1,621
2019 count
Owner
State
State Highway Agency

About this bridge

KY-81 over Slough is a prestressed concrete box beam or girders - single or spread carrying KY-81 over Slough in McLean County, Kentucky. It was built in 2020, so it is 5 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 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 1,621 vehicles a day, roughly 13% of them trucks, projected to reach 1,621 by 2039. The structure is 33 ft (10.1 m) long and 24 ft wide.

Location

Open in Google Maps
CarriesKY-81
CrossesSlough
Location.60 MI S of JCT Ky 85
RouteState Highway 81
CountyMcLean County
StateKentucky
Coordinates37.45639, -87.235
Functional classRural Major 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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
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 adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50.7 US tons
Inventory rating39.2 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadGreater than HL 93
Structure length33 ft (10.1 m)
Longest span31 ft (9.4 m)
Deck width24 ft (7.3 m)
Roadway width22 ft (6.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,621 (2019)
Projected traffic1,621 by 2039
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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-81 over Slough built?

It was built in 2020, making it 5 years old in 2025.

What condition is KY-81 over Slough 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 August 2024.

How much traffic does KY-81 over Slough carry?

About 1,621 vehicles per day (2019 count), of which roughly 13% are trucks.

How long is KY-81 over Slough?

The structure is 33 ft (10.1 m) long with a longest span of 31 ft (9.4 m) and a deck 24 ft wide.

Who owns KY-81 over Slough?

It is owned by the State Highway Agency.