US Bridges

KY-408 over Unname Stream

Fair

Marshall County, Kentucky · .20 MI West of JCT Ky 155 · Structure no. 079B00083N

Built
1952
73 years old
Condition
Fair
inspected June 2023
Type
Culvert
Concrete
Length
26 ft
2 main spans
Daily traffic
1,137
2023 count
Owner
State
State Highway Agency

About this bridge

KY-408 over Unname Stream is a concrete culvert carrying KY-408 over Unname Stream in Marshall County, Kentucky. It was built in 1952, so it is 73 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 1,137 vehicles a day, projected to reach 1,137 by 2043. The structure is 26 ft (7.9 m) long and 28 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesKY-408
CrossesUnname Stream
Location.20 MI West of JCT Ky 155
RouteState Highway 408
CountyMarshall County
StateKentucky
Coordinates36.86139, -88.38278
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy9: Superior 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 length26 ft (7.9 m)
Longest span12 ft (3.7 m)
Deck width28 ft (8.5 m)
Roadway width18 ft (5.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,137 (2023)
Projected traffic1,137 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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-408 over Unname Stream built?

It was built in 1952, making it 73 years old in 2025.

What condition is KY-408 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 June 2023.

How much traffic does KY-408 over Unname Stream carry?

About 1,137 vehicles per day (2023 count).

How long is KY-408 over Unname Stream?

The structure is 26 ft (7.9 m) long with a longest span of 12 ft (3.7 m) and a deck 28 ft wide.

Who owns KY-408 over Unname Stream?

It is owned by the State Highway Agency.