30th RD over Walnut River
Cowley County, Kansas · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- 30th RD over Walnut River in Cowley County, Kansas, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1928, making it 97 years old at the 2025 inventory.
- It carries about 240 vehicles a day (traffic count year 2021).
- Its listed owner is the county highway agency.
- It is one of 193 of the 340 inventoried bridges in Cowley County rated fair (56.8%); 18 (5.3%) are rated poor.
- 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 → (37.43719, -97.04041)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 5 | Fair condition |
| Superstructure | 5 | Fair condition |
| Substructure | 5 | Fair condition |
Bridge details
| Structure | Steel through truss |
| Length | about 333 ft |
| Location | 1.9W of Rock |
| NBI structure number | 000000000180210 |
| Condition class | Fair |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Kansas department of transportation.
Busiest bridges in Cowley County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Summit Street N. over C Street Canal | 1928 | 15,675 | Fair |
| US-77 Hwy over "c" Street Canal | 1997 | 6,234 | Good |
| US-77 Hwy over North Creek | 1997 | 6,234 | Good |
| US-77 Hwy over North Creek Tributary | 1998 | 6,234 | Good |
| US-77 Hwy over BNSF Railroad | 1998 | 6,234 | Good |
| US-77 Hwy over North Creek Tributary | 1998 | 6,234 | Good |
All bridges nearby: Cowley County, KS bridge conditions · every bridge in Cowley County · Kansas bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.