US Bridges

KY-3170 over Marshall Branch

FairPosted for load

Mason County, Kentucky · .05 MI W of JCT New Ky 11 · Structure no. 081B00007N

Built
1957
68 years old
Condition
Fair
inspected November 2023
Type
Culvert
Concrete
Length
29 ft
2 main spans
Daily traffic
292
2020 count
Owner
State
State Highway Agency

About this bridge

KY-3170 over Marshall Branch is a concrete culvert carrying KY-3170 over Marshall Branch in Mason County, Kentucky. It was built in 1957, so it is 68 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. Its operating status is: posted for load restriction.

It carries about 292 vehicles a day, projected to reach 292 by 2040. The structure is 29 ft (8.8 m) long and 103 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesKY-3170
CrossesMarshall Branch
Location.05 MI W of JCT New Ky 11
RouteState Highway 3170
CountyMason County
StateKentucky
Coordinates38.54889, -83.76417
Functional classRural Local

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 inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36.7 US tons
Inventory rating22 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadH 20
Structure length29 ft (8.8 m)
Longest span14 ft (4.2 m)
Deck width103 ft (31.4 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic292 (2020)
Projected traffic292 by 2040
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-3170 over Marshall Branch built?

It was built in 1957, making it 68 years old in 2025.

What condition is KY-3170 over Marshall Branch 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 November 2023.

How much traffic does KY-3170 over Marshall Branch carry?

About 292 vehicles per day (2020 count).

How long is KY-3170 over Marshall Branch?

The structure is 29 ft (8.8 m) long with a longest span of 14 ft (4.2 m) and a deck 103 ft wide.

Who owns KY-3170 over Marshall Branch?

It is owned by the State Highway Agency.