3425 RD Mile 21 over Big Hill Creek
Montgomery County, Kansas · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- 3425 RD Mile 21 over Big Hill Creek in Montgomery County, Kansas, is rated in poor condition in the 2025 National Bridge Inventory (as of ).
- It was built in 1956, making it 69 years old at the 2025 inventory.
- It carries about 516 vehicles a day (traffic count year 2010).
- Its listed owner is the county highway agency.
- A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.
View this bridge on a map → (37.15494, -95.58598)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 4 | Poor condition |
| Superstructure | 6 | Satisfactory condition |
| Substructure | 6 | Satisfactory condition |
Bridge details
| Structure | Continuous concrete tee beam |
| Length | about 267 ft |
| Location | 0.3E of Liberty |
| NBI structure number | 000000000630540 |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Kansas department of transportation.
All bridges nearby: Montgomery County, KS bridge conditions · Kansas bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.