Merdian Rd. over Trib. N. Cottonwood Riv.
Marion County, Kansas · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Merdian Rd. over Trib. N. Cottonwood Riv. in Marion County, Kansas, 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 1955, making it 70 years old at the 2025 inventory.
- It carries about 45 vehicles a day (traffic count year 2020).
- Its listed owner is the county highway agency.
- It is one of 163 of the 323 inventoried bridges in Marion County rated fair (50.5%); 35 (10.8%) 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 December 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 → (38.44181, -97.37189)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 6 | Satisfactory condition |
| Superstructure | 6 | 6 | Satisfactory condition |
| Substructure | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Continuous steel stringer or multi-beam girder |
| Length | about 33 ft |
| Location | 2.8S 7.6W of Durham |
| NBI structure number | 000570817005146 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | December 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 4: foundations stable, field review says exposed foundations need protection |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Kansas department of transportation.
Busiest bridges in Marion County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US-50 Hwy over Spring Creek | 1994 | 5,402 | Good |
| US-50 Hwy over Doyle Creek Drainage | 1994 | 5,097 | Good |
| US-50 Hwy over Doyle Creek Drainage | 1998 | 5,097 | Good |
| US-50 Hwy over Doyle Creek Drainage | 1998 | 5,097 | Good |
| US-50 Hwy over Doyle Creek Drainage | 1998 | 5,097 | Good |
| US-50 Hwy over Union Pacific RR. | 1994 | 4,812 | Good |
All bridges nearby: Marion County, KS bridge conditions · every bridge in Marion County · Kansas bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.