Irwin Rd. over Little Darby
Madison County, Ohio · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Irwin Rd. over Little Darby in Madison 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 1998, making it 27 years old at the 2025 inventory.
- It carries about 72 vehicles a day (traffic count year 2015).
- Its listed owner is the county highway agency.
- It is one of 132 of the 200 inventoried bridges in Madison County rated good (66.0%); 17 (8.5%) 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 → (40.1084, -83.4932)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 7 | Good condition |
| Superstructure | 7 | Good condition |
| Substructure | 8 | Very good condition |
Bridge details
| Structure | Steel through truss |
| Length | about 84 ft |
| Location | 2.80 Mi.n. of C.R.25 |
| NBI structure number | 4931491 |
| Condition class | Good |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Ohio department of transportation.
Busiest bridges in Madison County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-70 over Big Darby Creek | 1970 | 32,533 | Good |
| I-70 over Big Darby Creek | 1970 | 32,533 | Good |
| I-70 over Little Darby Creek | 1969 | 29,528 | Good |
| I-70 over Little Darby Creek | 1969 | 29,528 | Good |
| I-70 over Deer Creek | 1969 | 24,059 | Good |
| I-70 EB over Deer Creek | 1969 | 24,059 | Good |
All bridges nearby: Madison County, OH bridge conditions · every bridge in Madison County · Ohio bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.