US Bridges

KY-1578 over Doddy Branch

Fair

Allen County, Kentucky · 2.3 MI S of JCT Ky 1421 · Structure no. 002B00027N

Built
1956
69 years old
Condition
Fair
inspected April 2024
Type
Culvert
Concrete
Length
44 ft
3 main spans
Daily traffic
850
2023 count
Owner
State
State Highway Agency

About this bridge

KY-1578 over Doddy Branch is a concrete culvert carrying KY-1578 over Doddy Branch in Allen County, Kentucky. It was built in 1956, so it is 69 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 850 vehicles a day, roughly 13% of them trucks, projected to reach 850 by 2043. The structure is 44 ft (13.3 m) long and 35 ft wide. If it were closed, the detour would be 13 mi (21 km).

Location

Open in Google Maps
CarriesKY-1578
CrossesDoddy Branch
Location2.3 MI S of JCT Ky 1421
RouteState Highway 1578
CountyAllen County
StateKentucky
Coordinates36.65694, -86.11389
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 inspectionApril 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
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 spans3
Design loadH 15
Structure length44 ft (13.3 m)
Longest span14 ft (4.2 m)
Deck width35 ft (10.7 m)
Roadway width28 ft (8.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic850 (2023)
Projected traffic850 by 2043
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed13 mi (21 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-1578 over Doddy Branch built?

It was built in 1956, making it 69 years old in 2025.

What condition is KY-1578 over Doddy 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 April 2024.

How much traffic does KY-1578 over Doddy Branch carry?

About 850 vehicles per day (2023 count), of which roughly 13% are trucks.

How long is KY-1578 over Doddy Branch?

The structure is 44 ft (13.3 m) long with a longest span of 14 ft (4.2 m) and a deck 35 ft wide.

Who owns KY-1578 over Doddy Branch?

It is owned by the State Highway Agency.