US Bridges

I-24 over Knob Creek

Fair

Lyon County, Kentucky · Ebl .05 East of Ky 295 Op · Structure no. 072B00039R

Built
1977
48 years old
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
185 ft
3 main spans
Daily traffic
14,006
2019 count
Owner
State
State Highway Agency

About this bridge

I-24 over Knob Creek is a prestressed concrete continuous stringer/multi-beam or girder carrying I-24 over Knob Creek in Lyon County, Kentucky. It was built in 1977, so it is 48 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 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 14,006 vehicles a day, roughly 34% of them trucks, projected to reach 17,367 by 2039. The structure is 185 ft (56.3 m) long and 44 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-24
CrossesKnob Creek
LocationEbl .05 East of Ky 295 Op
RouteInterstate 24
CountyLyon County
StateKentucky
Coordinates37.07167, -88.09861
Functional classRural Principal Arterial - Interstate

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 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
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating84.4 US tons
Inventory rating50.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length185 ft (56.3 m)
Longest span71 ft (21.6 m)
Deck width44 ft (13.3 m)
Roadway width39 ft (12 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,006 (2019)
Projected traffic17,367 by 2039
Trucks34%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 I-24 over Knob Creek built?

It was built in 1977, making it 48 years old in 2025.

What condition is I-24 over Knob 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 March 2024.

How much traffic does I-24 over Knob Creek carry?

About 14,006 vehicles per day (2019 count), of which roughly 34% are trucks.

How long is I-24 over Knob Creek?

The structure is 185 ft (56.3 m) long with a longest span of 71 ft (21.6 m) and a deck 44 ft wide.

Who owns I-24 over Knob Creek?

It is owned by the State Highway Agency.