I-465 WB over Zionsville Road
Boone County, Indiana · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- I-465 WB over Zionsville Road in Boone County, Indiana, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1967 and reconstructed in 2021, making it 58 years old at the 2025 inventory.
- It carries about 57,399 vehicles a day (traffic count year 2021).
- Its listed owner is the state highway agency.
- It is one of 162 of the 292 inventoried bridges in Boone County rated fair (55.5%); 12 (4.1%) 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 April 2024, on a 24-month routine inspection cycle.
- A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.
View this bridge on a map → (39.92799, -86.25986)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 6 | Satisfactory condition |
| Superstructure | 6 | 6 | Satisfactory condition |
| Substructure | 7 | 7 | Good condition |
Bridge details
| Structure | Continuous steel stringer or multi-beam girder |
| Length | about 144 ft |
| Location | 01.71 W US 421 |
| NBI structure number | 050610 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | April 2024 |
| 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 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-65 NB over Prairie Creek Trail | 2014 | 57,066 | Fair |
| I-65 SB over Prairie Creek Trail | 2014 | 57,066 | Fair |
| I-65 over Prairie Creek | 1948 | 57,066 | Good |
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.