US Bridges

KY-310 over Unname Stream

Good

Ballard County, Kentucky · 1.5 MI N.W. of JCT Ky 358 · Structure no. 004B00048N

Built
1955
70 years old
Condition
Good
inspected April 2023
Type
Culvert
Concrete
Length
27 ft
2 main spans
Daily traffic
271
2021 count
Owner
State
State Highway Agency

About this bridge

KY-310 over Unname Stream is a concrete culvert carrying KY-310 over Unname Stream in Ballard County, Kentucky. It was built in 1955, so it is 70 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 271 vehicles a day, projected to reach 271 by 2041. The structure is 27 ft (8.2 m) long and 27 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

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CarriesKY-310
CrossesUnname Stream
Location1.5 MI N.W. of JCT Ky 358
RouteState Highway 310
CountyBallard County
StateKentucky
Coordinates37.115, -88.98667
Functional classRural Minor Collector

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 inspectionApril 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60 US tons
Inventory rating45 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadH 15
Structure length27 ft (8.2 m)
Longest span12 ft (3.7 m)
Deck width27 ft (8.2 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic271 (2021)
Projected traffic271 by 2041
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was KY-310 over Unname Stream built?

It was built in 1955, making it 70 years old in 2025.

What condition is KY-310 over Unname Stream 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 April 2023.

How much traffic does KY-310 over Unname Stream carry?

About 271 vehicles per day (2021 count).

How long is KY-310 over Unname Stream?

The structure is 27 ft (8.2 m) long with a longest span of 12 ft (3.7 m) and a deck 27 ft wide.

Who owns KY-310 over Unname Stream?

It is owned by the State Highway Agency.