US Bridges

SR 309 over Mud River

Fair

Marion County, Ohio · 2.61 MI E of SR98 · Structure no. 5101832

Built
1955
70 years old
Condition
Fair
inspected November 2024
Type
Slab
Concrete Continuous
Length
73 ft
3 main spans
Daily traffic
6,788
2015 count
Owner
State
State Highway Agency

About this bridge

SR 309 over Mud River is a concrete continuous slab carrying SR 309 over Mud River in Marion County, Ohio. It was built in 1955, so it is 70 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 6,788 vehicles a day, roughly 14% of them trucks, projected to reach 9,422 by 2035. The structure is 73 ft (22.3 m) long and 40 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesSR 309
CrossesMud River
Location2.61 MI E of SR98
RouteState Highway 309
CountyMarion County
StateOhio
Coordinates40.63083, -82.98522
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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionNovember 2024
Inspection intervalevery 12 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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.2 US tons
Inventory rating28.9 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length73 ft (22.3 m)
Longest span28 ft (8.4 m)
Deck width40 ft (12.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,788 (2015)
Projected traffic9,422 by 2035
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 Mud River built?

It was built in 1955, making it 70 years old in 2025.

What condition is SR 309 over Mud River 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 Mud River carry?

About 6,788 vehicles per day (2015 count), of which roughly 14% are trucks.

How long is SR 309 over Mud River?

The structure is 73 ft (22.3 m) long with a longest span of 28 ft (8.4 m) and a deck 40 ft wide.

Who owns SR 309 over Mud River?

It is owned by the State Highway Agency.