US Bridges

SR 309 over Rock Swale

Fair

Marion County, Ohio · 2.6 MI E of SR203 · Structure no. 5101727

Built
1984
41 years old
Condition
Fair
inspected November 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
51 ft
1 main span
Daily traffic
3,565
2015 count
Owner
State
State Highway Agency

About this bridge

SR 309 over Rock Swale is a prestressed concrete box beam or girders - multiple carrying SR 309 over Rock Swale in Marion County, Ohio. It was built in 1984, so it is 41 years old, younger 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 3,565 vehicles a day, roughly 11% of them trucks, projected to reach 4,948 by 2035. The structure is 51 ft (15.6 m) long and 36 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesSR 309
CrossesRock Swale
Location2.6 MI E of SR203
RouteState Highway 309
CountyMarion County
StateOhio
Coordinates40.6048, -83.17081
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.
Substructure8 Very GoodNo problems noted.
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 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 rating60.4 US tons
Inventory rating43.5 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length51 ft (15.6 m)
Longest span50 ft (15.2 m)
Deck width36 ft (11 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,565 (2015)
Projected traffic4,948 by 2035
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 Rock Swale built?

It was built in 1984, making it 41 years old in 2025.

What condition is SR 309 over Rock Swale 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 Rock Swale carry?

About 3,565 vehicles per day (2015 count), of which roughly 11% are trucks.

How long is SR 309 over Rock Swale?

The structure is 51 ft (15.6 m) long with a longest span of 50 ft (15.2 m) and a deck 36 ft wide.

Who owns SR 309 over Rock Swale?

It is owned by the State Highway Agency.