30TH Rd (rs 442) over N Fk. Black Vermillion
Marshall County, Kansas · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- 30TH Rd (rs 442) over N Fk. Black Vermillion in Marshall 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 1948, making it 77 years old at the 2025 inventory.
- It carries about 178 vehicles a day (traffic count year 2007).
- Its listed owner is the county highway agency.
- It is one of 159 of the 403 inventoried bridges in Marshall County rated fair (39.5%); 42 (10.4%) are rated poor.
- Its traffic status in the 2025 inventory is posted for load (NBI item 41).
- Its condition class and component ratings are unchanged from the 2024 inventory.
- Its most recent inspection on record is dated June 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 → (39.76479, -96.25843)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 5 | 5 | Fair condition |
| Superstructure | 7 | 7 | Good condition |
| Substructure | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Continuous steel stringer or multi-beam girder |
| Length | about 222 ft |
| Location | 3.0N 0.5E of Vermillion |
| NBI structure number | 000000000580330 |
| Condition class | Fair |
| Traffic status (item 41) | Posted for load |
| Last inspection (item 90) | June 2023 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 5: foundations stable, scour within the limits of the footing or piles |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Kansas department of transportation.
Busiest bridges in Marshall County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| U36 Hwy over Bigblueriv&uprr&localrd | 2004 | 5,184 | Good |
| US36 Hwy over Spring Creek Drainage | 1957 | 3,333 | Good |
| US-36 Hwy over Spring Creek | 1993 | 3,333 | Good |
| US36 Hwy over N F Blk Vermillion R Drn | 1958 | 3,045 | Good |
| US 36 Hwy over Robidoux Creek | 1990 | 2,986 | Good |
| US36 Hwy over N F Blk Vermillion R Drn | 1958 | 2,608 | Fair |
All bridges nearby: Marshall County, KS bridge conditions · every bridge in Marshall County · Kansas bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.