US Bridges

SR 309 over Conrail Railroad

Good

Hardin County, Ohio · 0.5 MI West of Kenton · Structure no. 3300129

Built
1941
84 years old, rebuilt 1970
Condition
Good
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
324 ft
5 main spans
Daily traffic
7,134
2015 count
Owner
State
State Highway Agency

About this bridge

SR 309 over Conrail Railroad is a steel continuous stringer/multi-beam or girder carrying SR 309 over Conrail Railroad in Hardin County, Ohio. It was built in 1941 and reconstructed in 1970, so it is 84 years old, older than the Ohio average of 47.3 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 7,134 vehicles a day, roughly 6% of them trucks, projected to reach 9,902 by 2035. The structure is 324 ft (98.8 m) long and 36 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesSR 309
CrossesConrail Railroad
Location0.5 MI West of Kenton
RouteState Highway 309
CountyHardin County
StateOhio
Coordinates40.65566, -83.6338
Functional classUrban Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating46.4 US tons
Inventory rating28.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadH 15
Structure length324 ft (98.8 m)
Longest span76 ft (23.2 m)
Deck width36 ft (11.1 m)
Roadway width33 ft (10.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,134 (2015)
Projected traffic9,902 by 2035
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$130,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was SR 309 over Conrail Railroad built?

It was built in 1941, making it 84 years old in 2025. It was reconstructed in 1970.

What condition is SR 309 over Conrail Railroad 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 June 2023.

How much traffic does SR 309 over Conrail Railroad carry?

About 7,134 vehicles per day (2015 count), of which roughly 6% are trucks.

How long is SR 309 over Conrail Railroad?

The structure is 324 ft (98.8 m) long with a longest span of 76 ft (23.2 m) and a deck 36 ft wide.

Who owns SR 309 over Conrail Railroad?

It is owned by the State Highway Agency.