US Bridges

I-71 over Big South Fork Creek

Good

Gallatin County, Kentucky · .60 MI S.W. of Boone Cl · Structure no. 039B00028N

Built
1967
58 years old
Condition
Good
inspected July 2021
Type
Culvert
Concrete
Length
29 ft
1 main span
Daily traffic
37,745
2023 count
Owner
State
State Highway Agency

About this bridge

I-71 over Big South Fork Creek is a concrete culvert carrying I-71 over Big South Fork Creek in Gallatin 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 good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 37,745 vehicles a day, roughly 34% of them trucks, projected to reach 46,803 by 2043. The structure is 29 ft (8.8 m) long and 470 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

CarriesI-71
CrossesBig South Fork Creek
Location.60 MI S.W. of Boone Cl
RouteInterstate 71
Coordinates38.80528, -84.72611
Functional classRural Principal Arterial - Interstate

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert7 GoodSome minor problems.
Last inspectionJuly 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment9: Superior to present desirable criteria
Operating rating110 US tons
Inventory rating110 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHS 20
Structure length29 ft (8.8 m)
Longest span29 ft (8.8 m)
Deck width470 ft (143.3 m)
Roadway width84 ft (25.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic37,745 (2023)
Projected traffic46,803 by 2043
Trucks34%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was I-71 over Big South Fork Creek built?

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

What condition is I-71 over Big South Fork Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in July 2021.

How much traffic does I-71 over Big South Fork Creek carry?

About 37,745 vehicles per day (2023 count), of which roughly 34% are trucks.

How long is I-71 over Big South Fork Creek?

The structure is 29 ft (8.8 m) long with a longest span of 29 ft (8.8 m) and a deck 470 ft wide.

Who owns I-71 over Big South Fork Creek?

It is owned by the State Highway Agency.