US Bridges

SR-309 over Olantangy River

Good

Marion County, Ohio · SR309 over Olentangy Rive · Structure no. 5101875

Built
1999
26 years old
Condition
Good
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
174 ft
3 main spans
Daily traffic
5,292
2015 count
Owner
State
State Highway Agency

About this bridge

SR-309 over Olantangy River is a steel continuous stringer/multi-beam or girder carrying SR-309 over Olantangy River in Marion County, Ohio. It was built in 1999, so it is 26 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 5,292 vehicles a day, roughly 14% of them trucks, projected to reach 7,345 by 2035. The structure is 174 ft (53 m) long and 43 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

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CarriesSR-309
CrossesOlantangy River
LocationSR309 over Olentangy Rive
RouteState Highway 309
CountyMarion County
StateOhio
Coordinates40.63338, -82.96265
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
Deck9 ExcellentNo problems noted.
Superstructure9 ExcellentNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation8: Equal to present desirable 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 alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating48.9 US tons
Inventory rating46.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length174 ft (53 m)
Longest span65 ft (19.8 m)
Deck width43 ft (13.2 m)
Roadway width43 ft (13.2 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 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 Olantangy River built?

It was built in 1999, making it 26 years old in 2025.

What condition is SR-309 over Olantangy River 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 November 2024.

How much traffic does SR-309 over Olantangy River carry?

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

How long is SR-309 over Olantangy River?

The structure is 174 ft (53 m) long with a longest span of 65 ft (19.8 m) and a deck 43 ft wide.

Who owns SR-309 over Olantangy River?

It is owned by the State Highway Agency.