US-400 HWY over Little Walnut River
FairButler County, Kansas · 3.68 MI E of US-77 E JCT · Structure no. 999940000080421
- Built
- 1970
- 55 years old
- Condition
- Fair
- inspected September 2024
- Type
- Tee Beam
- Concrete Continuous
- Length
- 383 ft
- 6 main spans
- Daily traffic
- 5,627
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
US-400 HWY over Little Walnut River is a concrete continuous tee beam carrying US-400 HWY over Little Walnut River in Butler County, Kansas. It was built in 1970, so it is 55 years old, older than the Kansas average of 52.8 years.
The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
It carries about 5,627 vehicles a day, roughly 23% of them trucks, projected to reach 6,866 by 2044. The structure is 383 ft (116.6 m) long and 46 ft wide. If it were closed, the detour would be 3.1 mi (5 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US-400 HWY over Little Walnut River built?
It was built in 1970, making it 55 years old in 2025.
What condition is US-400 HWY over Little Walnut River in?
The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in September 2024.
How much traffic does US-400 HWY over Little Walnut River carry?
About 5,627 vehicles per day (2023 count), of which roughly 23% are trucks.
How long is US-400 HWY over Little Walnut River?
The structure is 383 ft (116.6 m) long with a longest span of 70 ft (21.3 m) and a deck 46 ft wide.
Who owns US-400 HWY over Little Walnut River?
It is owned by the State Highway Agency.