Darke-mercer over Corwin Jt.dt
Darke County, Ohio · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Darke-mercer over Corwin Jt.dt in Darke 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 1997, making it 28 years old at the 2025 inventory.
- It carries about 1,220 vehicles a day (traffic count year 2015).
- Its listed owner is the county highway agency.
- It is one of 386 of the 463 inventoried bridges in Darke County rated good (83.4%); 2 (0.4%) are rated poor.
- 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 → (40.35333, -84.58861)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 7 | Good condition |
| Superstructure | 7 | Good condition |
| Substructure | 8 | Very good condition |
Bridge details
| Structure | Concrete multiple box beam |
| Length | about 23 ft |
| Location | .35 Mi W Groff Rd |
| NBI structure number | 1954970 |
| Condition class | Good |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Ohio department of transportation.
Busiest bridges in Darke County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| SR-121 over Greenville Creek | 1934 | 12,951 | Good |
| SR-49 over Greenville Creek | 1907 | 11,293 | Good |
| Usr-36 over SR 571 | 1969 | 9,298 | Good |
| SR-49 over Pansing Joint Ditch 433 | 1989 | 7,912 | Good |
| SR-49 over Dividing Branch | 1994 | 7,818 | Good |
| SR-49 over Bridge Creek | 1989 | 7,714 | Good |
All bridges nearby: Darke County, OH bridge conditions · every bridge in Darke County · Ohio bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.