US Bridges

KY-9 over Twelvemile Creek

Good

Campbell County, Kentucky · 400 SE Ky 1997 · Structure no. 019B00068N

Built
1989
36 years old
Condition
Good
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
477 ft
3 main spans
Daily traffic
10,542
2021 count
Owner
State
State Highway Agency

About this bridge

KY-9 over Twelvemile Creek is a steel continuous stringer/multi-beam or girder carrying KY-9 over Twelvemile Creek in Campbell County, Kentucky. It was built in 1989, so it is 36 years old, younger 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 10,542 vehicles a day, roughly 15% of them trucks, projected to reach 10,542 by 2041. The structure is 477 ft (145.4 m) long and 85 ft wide. If it were closed, the detour would be 13 mi (21 km).

Location

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CarriesKY-9
CrossesTwelvemile Creek
Location400 SE Ky 1997
RouteState Highway 9
CountyCampbell County
StateKentucky
Coordinates38.95194, -84.33667
Functional classRural Principal Arterial - Other

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2023
Inspection intervalevery 24 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 rating56.7 US tons
Inventory rating34 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 25 or greater
Structure length477 ft (145.4 m)
Longest span182 ft (55.5 m)
Deck width85 ft (26 m)
Roadway width83 ft (25.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,542 (2021)
Projected traffic10,542 by 2041
Trucks15%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed13 mi (21 km)
TollOn a free road
National Highway SystemYes

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 KY-9 over Twelvemile Creek built?

It was built in 1989, making it 36 years old in 2025.

What condition is KY-9 over Twelvemile 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 August 2023.

How much traffic does KY-9 over Twelvemile Creek carry?

About 10,542 vehicles per day (2021 count), of which roughly 15% are trucks.

How long is KY-9 over Twelvemile Creek?

The structure is 477 ft (145.4 m) long with a longest span of 182 ft (55.5 m) and a deck 85 ft wide.

Who owns KY-9 over Twelvemile Creek?

It is owned by the State Highway Agency.