Oak Street over Irishman Run
Boone County, Indiana · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Oak Street over Irishman Run in Boone County, Indiana, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the culvert, rated 7 (good condition) on the 0-9 scale.
- It was built in 2009, making it 16 years old at the 2025 inventory.
- It carries about 14,000 vehicles a day (traffic count year 2017).
- Its listed owner is the county highway agency.
- It is one of 118 of the 292 inventoried bridges in Boone County rated good (40.4%); 12 (4.1%) 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 → (39.94994, -86.29346)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Culvert | 7 | Good condition |
Bridge details
| Structure | Concrete culvert |
| Length | about 37 ft |
| Location | 02.98 W US 421 |
| NBI structure number | 0600210 |
| Condition class | Good |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Indiana department of transportation.
Busiest bridges in Boone County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-65 over Prairie Creek | 1948 | 73,132 | Fair |
| CR 100 Ehall-baker over I-65 Sb/nb | 1958 | 73,132 | Fair |
| I-65 over Prairie Creek | 2010 | 73,132 | Good |
| I-465 WB over Zionsville Road | 1967 | 57,399 | Fair |
| I-65 NB over Prairie Creek Trail | 2014 | 57,066 | Fair |
| I-65 SB over Prairie Creek Trail | 2014 | 57,066 | Fair |
All bridges nearby: Boone County, IN bridge conditions · every bridge in Boone County · Indiana bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.