US Bridges

KY-1121 over Twelve Mile CR @gubser M

Fair

Campbell County, Kentucky · 2.8 MI N of S-Jct Ky 10 · Structure no. 019B00027N

Built
1967
58 years old
Condition
Fair
inspected August 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
70 ft
1 main span
Daily traffic
150
2021 count
Owner
State
State Highway Agency

About this bridge

KY-1121 over Twelve Mile CR @gubser M is a prestressed concrete box beam or girders - multiple carrying KY-1121 over Twelve Mile CR @gubser M in Campbell 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 5 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 150 vehicles a day, projected to reach 150 by 2041. The structure is 70 ft (21.3 m) long and 24 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesKY-1121
CrossesTwelve Mile CR @gubser M
Location2.8 MI N of S-Jct Ky 10
RouteState Highway 1121
CountyCampbell County
StateKentucky
Coordinates38.88806, -84.30917
Functional classRural Minor Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating73.9 US tons
Inventory rating44.3 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length70 ft (21.3 m)
Longest span64 ft (19.5 m)
Deck width24 ft (7.3 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic150 (2021)
Projected traffic150 by 2041
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

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 KY-1121 over Twelve Mile CR @gubser M built?

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

What condition is KY-1121 over Twelve Mile CR @gubser M 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 August 2023.

How much traffic does KY-1121 over Twelve Mile CR @gubser M carry?

About 150 vehicles per day (2021 count).

How long is KY-1121 over Twelve Mile CR @gubser M?

The structure is 70 ft (21.3 m) long with a longest span of 64 ft (19.5 m) and a deck 24 ft wide.

Who owns KY-1121 over Twelve Mile CR @gubser M?

It is owned by the State Highway Agency.