US 421 NB over I-74 Eb/wb
Decatur County, Indiana · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- US 421 NB over I-74 Eb/wb in Decatur County, Indiana, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the superstructure, rated 7 (good condition) on the 0-9 scale.
- It was built in 2008, making it 17 years old at the 2025 inventory.
- It carries about 2,648 vehicles a day (traffic count year 2014).
- Its listed owner is the state highway agency.
- It is one of 73 of the 220 inventoried bridges in Decatur County rated good (33.2%); 13 (5.9%) 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 January 2024, 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 → (39.3627, -85.51445)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 8 | 8 | Very good condition |
| Superstructure | 7 | 7 | Good condition |
| Substructure | 7 | 7 | Good condition |
Bridge details
| Structure | Continuous prestressed concrete tee beam |
| Length | about 436 ft |
| Location | 01.42 N SR 3 |
| NBI structure number | 076592 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | January 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 Decatur County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 421 over Muddy Fork Sand Creek | 2008 | 13,901 | Fair |
| SR 3 over I-74 Eb/wb | 1962 | 13,680 | Fair |
| I-74 Wbl over Clifty Creek | 1962 | 11,344 | Fair |
| I-74 EB over Flatrock River | 1961 | 11,343 | Fair |
| I-74 WB over Flatrock River | 1961 | 11,343 | Fair |
| I-74 Ebl over Mill Creek | 1961 | 10,341 | Good |
All bridges nearby: Decatur County, IN bridge conditions · every bridge in Decatur County · Indiana bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.