US Bridges

SR-309 over Flat Run

Good

Morrow County, Ohio · 3.69 MI E of Marion CO · Structure no. 5900344

Built
2009
16 years old
Condition
Good
inspected October 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
116 ft
1 main span
Daily traffic
3,529
2015 count
Owner
State
State Highway Agency

About this bridge

SR-309 over Flat Run is a prestressed concrete stringer/multi-beam or girder carrying SR-309 over Flat Run in Morrow County, Ohio. It was built in 2009, so it is 16 years old, younger 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 3,529 vehicles a day, roughly 16% of them trucks, projected to reach 4,898 by 2035. The structure is 116 ft (35.3 m) long and 44 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesSR-309
CrossesFlat Run
Location3.69 MI E of Marion CO
RouteState Highway 309
CountyMorrow County
StateOhio
Coordinates40.6725, -82.83722
Functional classRural 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
Deck8 Very GoodNo problems noted.
Superstructure9 ExcellentNo problems noted.
Substructure9 ExcellentNo problems noted.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length116 ft (35.3 m)
Longest span112 ft (34.1 m)
Deck width44 ft (13.4 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,529 (2015)
Projected traffic4,898 by 2035
Trucks16%
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 Flat Run built?

It was built in 2009, making it 16 years old in 2025.

What condition is SR-309 over Flat Run 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 October 2024.

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

About 3,529 vehicles per day (2015 count), of which roughly 16% are trucks.

How long is SR-309 over Flat Run?

The structure is 116 ft (35.3 m) long with a longest span of 112 ft (34.1 m) and a deck 44 ft wide.

Who owns SR-309 over Flat Run?

It is owned by the State Highway Agency.