US Bridges

I-75 Nc over Ky 536 (mt Zion Rd)

Fair

Boone County, Kentucky · 1.8 MI S JCT US 42 Sbl · Structure no. 008B00080L

Built
1992
33 years old
Condition
Fair
inspected June 2021
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
159 ft
3 main spans
Daily traffic
70,784
2023 count
Owner
State
State Highway Agency

About this bridge

I-75 Nc over Ky 536 (mt Zion Rd) is a prestressed concrete continuous stringer/multi-beam or girder carrying I-75 Nc over Ky 536 (mt Zion Rd) in Boone County, Kentucky. It was built in 1992, so it is 33 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 70,784 vehicles a day, roughly 17% of them trucks, projected to reach 77,862 by 2043. The structure is 159 ft (48.5 m) long and 75 ft wide.

Location

Open in Google Maps
CarriesI-75 Nc
CrossesKy 536 (mt Zion Rd)
Location1.8 MI S JCT US 42 Sbl
RouteInterstate 75
CountyBoone County
StateKentucky
Coordinates38.95667, -84.63472
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 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating70.5 US tons
Inventory rating42.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 25 or greater
Structure length159 ft (48.5 m)
Longest span53 ft (16.2 m)
Deck width75 ft (23 m)
Roadway width73 ft (22.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic70,784 (2023)
Projected traffic77,862 by 2043
Trucks17%
Lanes on structure4
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
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 proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$1.5 million
NavigationNo navigation control on waterway

Frequently asked questions

When was I-75 Nc over Ky 536 (mt Zion Rd) built?

It was built in 1992, making it 33 years old in 2025.

What condition is I-75 Nc over Ky 536 (mt Zion Rd) 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 2021.

How much traffic does I-75 Nc over Ky 536 (mt Zion Rd) carry?

About 70,784 vehicles per day (2023 count), of which roughly 17% are trucks.

How long is I-75 Nc over Ky 536 (mt Zion Rd)?

The structure is 159 ft (48.5 m) long with a longest span of 53 ft (16.2 m) and a deck 75 ft wide.

Who owns I-75 Nc over Ky 536 (mt Zion Rd)?

It is owned by the State Highway Agency.