US Bridges

I-75 Ramp over West Rmp KY18 to I75SB

Fair

Boone County, Kentucky · SB Mall Rmp @ West Ramp · Structure no. 008B00074N

Built
1990
35 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
378 ft
2 main spans
Daily traffic
140,378
2023 count
Owner
State
State Highway Agency

About this bridge

I-75 Ramp over West Rmp KY18 to I75SB is a steel continuous stringer/multi-beam or girder carrying I-75 Ramp over West Rmp KY18 to I75SB in Boone County, Kentucky. It was built in 1990, so it is 35 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 140,378 vehicles a day, roughly 15% of them trucks, projected to reach 154,415 by 2043. The structure is 378 ft (115.2 m) long and 29 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-75 Ramp
CrossesWest Rmp KY18 to I75SB
LocationSB Mall Rmp @ West Ramp
RouteInterstate 75
CountyBoone County
StateKentucky
Coordinates38.99222, -84.64528
Functional classUrban 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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating38.9 US tons
Inventory rating30 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 25 or greater
Structure length378 ft (115.2 m)
Longest span186 ft (56.7 m)
Deck width29 ft (8.9 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic140,378 (2023)
Projected traffic154,415 by 2043
Trucks15%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
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-75 Ramp over West Rmp KY18 to I75SB built?

It was built in 1990, making it 35 years old in 2025.

What condition is I-75 Ramp over West Rmp KY18 to I75SB 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 I-75 Ramp over West Rmp KY18 to I75SB carry?

About 140,378 vehicles per day (2023 count), of which roughly 15% are trucks.

How long is I-75 Ramp over West Rmp KY18 to I75SB?

The structure is 378 ft (115.2 m) long with a longest span of 186 ft (56.7 m) and a deck 29 ft wide.

Who owns I-75 Ramp over West Rmp KY18 to I75SB?

It is owned by the State Highway Agency.