US 421 over Kankakee River
Starke County, Indiana · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- US 421 over Kankakee River in Starke County, Indiana, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the superstructure, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1999, making it 26 years old at the 2025 inventory.
- It carries about 5,115 vehicles a day (traffic count year 2004).
- Its listed owner is the state highway agency.
- It is one of 35 of the 87 inventoried bridges in Starke County rated fair (40.2%); 5 (5.7%) 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 August 2023, 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 → (41.25661, -86.89065)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 7 | Good condition |
| Superstructure | 5 | 5 | Fair condition |
| Substructure | 7 | 7 | Good condition |
Bridge details
| Structure | Continuous prestressed concrete stringer or multi-beam girder |
| Length | about 334 ft |
| Location | 02.87 N SR 10 |
| NBI structure number | 032450 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | August 2023 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 8: foundations stable, scour above the top of the footing |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Indiana department of transportation.
Busiest bridges in Starke County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 30 WB over Robbins Ditch | 1958 | 11,406 | Fair |
| US 35 over Yellow River | 1929 | 8,432 | Good |
| US 35 over Craigmile Ditch | 1924 | 7,176 | Fair |
| US 30 EB over Robbins Ditch | 1958 | 6,993 | Fair |
| US 30 WB over Jain Ditch | 1963 | 6,793 | Good |
| US 30 EB over Shearing Ditch | 1958 | 6,743 | Good |
All bridges nearby: Starke County, IN bridge conditions · every bridge in Starke County · Indiana bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.