SR-309 over Olantangy River
Marion County, Ohio · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- SR-309 over Olantangy River in Marion County, Ohio, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the substructure, rated 8 (very good condition) on the 0-9 scale.
- It was built in 1999, making it 26 years old at the 2025 inventory.
- It carries about 5,292 vehicles a day (traffic count year 2015).
- Its listed owner is the state highway agency.
- It is one of 139 of the 230 inventoried bridges in Marion County rated good (60.4%); 9 (3.9%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- Its condition class and component ratings are unchanged from the 2024 inventory.
- Its most recent inspection on record is dated November 2024, on a 24-month routine inspection cycle.
- A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.
View this bridge on a map → (40.63338, -82.96265)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 9 | 9 | Excellent condition |
| Superstructure | 9 | 9 | Excellent condition |
| Substructure | 8 | 8 | Very good condition |
Bridge details
| Structure | Continuous steel stringer or multi-beam girder |
| Length | about 173 ft |
| Location | SR309 over Olentangy Rive |
| NBI structure number | 5101875 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | November 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 5: foundations stable, scour within the limits of the footing or piles |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Ohio department of transportation.
Busiest bridges in Marion County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| SR 95 over Graves Creek | 1965 | 23,882 | Fair |
| SR 309 over Grave Creek | 1998 | 13,059 | Good |
| US 23 over over Sr98-0011 | 1965 | 11,517 | Good |
| US 23 over over Sr98-0013 | 1965 | 11,517 | Good |
| US 23 over Cauquaw CR | 1965 | 11,517 | Good |
| US 23 over Cauquaw CR | 1965 | 11,517 | Good |
All bridges nearby: Marion County, OH bridge conditions · every bridge in Marion County · Ohio bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.