US Bridges

I-75 S Nc over Flat Gap Road

Fair

Rockcastle County, Kentucky · Sbl 1M Sou. of Madison Cl · Structure no. 102B00041L

Built
1967
58 years old
Condition
Fair
inspected September 2024
Type
Culvert
Concrete
Length
26 ft
1 main span
Daily traffic
23,819
2023 count
Owner
State
State Highway Agency

About this bridge

I-75 S Nc over Flat Gap Road is a concrete culvert carrying I-75 S Nc over Flat Gap Road in Rockcastle County, Kentucky. It was built in 1967, so it is 58 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 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 23,819 vehicles a day, roughly 26% of them trucks, projected to reach 29,536 by 2043. The structure is 26 ft (7.9 m) long. If it were closed, the detour would be 100 mi (161 km).

Location

Open in Google Maps
CarriesI-75 S Nc
CrossesFlat Gap Road
LocationSbl 1M Sou. of Madison Cl
RouteInterstate 75
CountyRockcastle County
StateKentucky
Coordinates37.52333, -84.32
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
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating93.3 US tons
Inventory rating56 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHS 20
Structure length26 ft (7.9 m)
Longest span23 ft (7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic23,819 (2023)
Projected traffic29,536 by 2043
Trucks26%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed100 mi (161 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 statusPossibly eligible for the National Register; requires further investigation
Work proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$65,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-75 S Nc over Flat Gap Road built?

It was built in 1967, making it 58 years old in 2025.

What condition is I-75 S Nc over Flat Gap Road 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 September 2024.

How much traffic does I-75 S Nc over Flat Gap Road carry?

About 23,819 vehicles per day (2023 count), of which roughly 26% are trucks.

How long is I-75 S Nc over Flat Gap Road?

The structure is 26 ft (7.9 m) long with a longest span of 23 ft (7 m).

Who owns I-75 S Nc over Flat Gap Road?

It is owned by the State Highway Agency.