SR 309 over Auglaize River
Allen County, Ohio · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- SR 309 over Auglaize River in Allen County, Ohio, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 8 (very good condition) on the 0-9 scale.
- It was built in 1990, making it 35 years old at the 2025 inventory.
- It carries about 10,224 vehicles a day (traffic count year 2015).
- Its listed owner is the state highway agency.
- It is one of 252 of the 364 inventoried bridges in Allen County rated good (69.2%); 33 (9.1%) 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 October 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 → (40.81869, -84.27456)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 8 | 8 | Very good condition |
| Superstructure | 8 | 8 | Very good condition |
| Substructure | 8 | 8 | Very good condition |
Bridge details
| Structure | Continuous prestressed concrete multiple box beam |
| Length | about 206 ft |
| Location | East of US 30 Connector |
| NBI structure number | 0200859 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | October 2023 |
| 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 Allen County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Ir 75 over Lost Creek | 2014 | 39,060 | Good |
| Ir 75 SB over SR 65 | 2015 | 22,650 | Good |
| Ir 75 NB over SR 65 | 2016 | 22,650 | Good |
| Ir 75 SB over I & O RR | 2015 | 22,650 | Good |
| Ir 75 NB over I & O RR | 2016 | 22,650 | Good |
| SR 117 over Branch of Lost Creek | 2013 | 21,540 | Good |
All bridges nearby: Allen County, OH bridge conditions · every bridge in Allen County · Ohio bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.