SR 309 over Conrail Railroad
Hardin County, Ohio · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- SR 309 over Conrail Railroad in Hardin County, Ohio, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 7 (good condition) on the 0-9 scale.
- It was built in 1941 and reconstructed in 1970, making it 84 years old at the 2025 inventory.
- It carries about 7,134 vehicles a day (traffic count year 2015).
- Its listed owner is the state highway agency.
- It is one of 186 of the 277 inventoried bridges in Hardin County rated good (67.1%); 15 (5.4%) 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 June 2023, 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 → (40.65566, -83.6338)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 7 | Good condition |
| Superstructure | 7 | 7 | Good condition |
| Substructure | 7 | 7 | Good condition |
Bridge details
| Structure | Continuous steel stringer or multi-beam girder |
| Length | about 324 ft |
| Location | 0.5 Mi West of Kenton |
| NBI structure number | 3300129 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | June 2023 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | N: not over a waterway |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Ohio department of transportation.
Busiest bridges in Hardin County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| SR 31 & 53 S Main over Scioto River # | 1968 | 9,687 | Good |
| Usr 68 over Taylor Creek | 1962 | 8,002 | Good |
| US68/SR67S.DETROIT over Scioto River # | 1983 | 7,361 | Good |
| Usr 68 over Cessna Creek | 1988 | 5,889 | Fair |
| SR 235 over Hog Creek | 1989 | 4,748 | Good |
| SR 31 over Panther Creek | 1941 | 4,611 | Good |
All bridges nearby: Hardin County, OH bridge conditions · every bridge in Hardin County · Ohio bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.