US Bridges

KY-70 over Unname Stream

Fair

Muhlenberg County, Kentucky · 1.0 MI East of JCT US 431 · Structure no. 089B00025N

Built
1933
92 years old
Condition
Fair
inspected September 2021
Type
Culvert
Concrete
Length
24 ft
2 main spans
Daily traffic
1,446
2019 count
Owner
State
State Highway Agency

About this bridge

KY-70 over Unname Stream is a concrete culvert carrying KY-70 over Unname Stream in Muhlenberg County, Kentucky. It was built in 1933, so it is 92 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 1,446 vehicles a day, roughly 7% of them trucks, projected to reach 1,446 by 2039. The structure is 24 ft (7.3 m) long. If it were closed, the detour would be 26.7 mi (43 km).

Location

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CarriesKY-70
CrossesUnname Stream
Location1.0 MI East of JCT US 431
RouteState Highway 70
CountyMuhlenberg County
StateKentucky
Coordinates37.20444, -87.02056
Functional classRural Major 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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating60 US tons
Inventory rating45 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadH 15
Structure length24 ft (7.3 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,446 (2019)
Projected traffic1,446 by 2039
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed26.7 mi (43 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-70 over Unname Stream built?

It was built in 1933, making it 92 years old in 2025.

What condition is KY-70 over Unname Stream 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 2021.

How much traffic does KY-70 over Unname Stream carry?

About 1,446 vehicles per day (2019 count), of which roughly 7% are trucks.

How long is KY-70 over Unname Stream?

The structure is 24 ft (7.3 m) long with a longest span of 10 ft (3 m).

Who owns KY-70 over Unname Stream?

It is owned by the State Highway Agency.