US Bridges

SR 309 over Flat Run

Fair

Morrow County, Ohio · 4.82 MI E of Marion CO Li · Structure no. 5900360

Built
1965
60 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
49 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 steel stringer/multi-beam or girder carrying SR 309 over Flat Run in Morrow County, Ohio. It was built in 1965, so it is 60 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 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 3,529 vehicles a day, roughly 16% of them trucks, projected to reach 4,898 by 2035. The structure is 49 ft (15 m) long and 44 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesSR 309
CrossesFlat Run
Location4.82 MI E of Marion CO Li
RouteState Highway 309
CountyMorrow County
StateOhio
Coordinates40.68159, -82.82135
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating50 US tons
Inventory rating28.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length49 ft (15 m)
Longest span47 ft (14.3 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 closed1.9 mi (3 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 1965, making it 60 years old in 2025.

What condition is SR 309 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 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 49 ft (15 m) long with a longest span of 47 ft (14.3 m) and a deck 44 ft wide.

Who owns SR 309 over Flat Run?

It is owned by the State Highway Agency.