US Bridges

SR 309 over Over Flat Run

Fair

Marion County, Ohio · 4.72 MI E of SR 98 · Structure no. 5101921

Built
1958
67 years old
Condition
Fair
inspected November 2024
Type
Slab
Concrete Continuous
Length
106 ft
3 main spans
Daily traffic
5,292
2015 count
Owner
State
State Highway Agency

About this bridge

SR 309 over Over Flat Run is a concrete continuous slab carrying SR 309 over Over Flat Run in Marion County, Ohio. It was built in 1958, so it is 67 years old, older than the Ohio average of 47.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 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 5,292 vehicles a day, roughly 14% of them trucks, projected to reach 7,345 by 2035. The structure is 106 ft (32.2 m) long and 40 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesSR 309
CrossesOver Flat Run
Location4.72 MI E of SR 98
RouteState Highway 309
CountyMarion County
StateOhio
Coordinates40.65962, -82.874
Functional classRural Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating42.1 US tons
Inventory rating32.5 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length106 ft (32.2 m)
Longest span40 ft (12.2 m)
Deck width40 ft (12.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,292 (2015)
Projected traffic7,345 by 2035
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 309 over Over Flat Run built?

It was built in 1958, making it 67 years old in 2025.

What condition is SR 309 over Over Flat Run 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 2024.

How much traffic does SR 309 over Over Flat Run carry?

About 5,292 vehicles per day (2015 count), of which roughly 14% are trucks.

How long is SR 309 over Over Flat Run?

The structure is 106 ft (32.2 m) long with a longest span of 40 ft (12.2 m) and a deck 40 ft wide.

Who owns SR 309 over Over Flat Run?

It is owned by the State Highway Agency.