US166 HWY WB over Onion Creek
FairMontgomery County, Kansas · 13.78 MI E Sjct US75 WB · Structure no. 999916600630381
- Built
- 1970
- 55 years old
- Condition
- Fair
- inspected March 2023
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 293 ft
- 4 main spans
- Daily traffic
- 2,627
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
US166 HWY WB over Onion Creek is a steel continuous stringer/multi-beam or girder carrying US166 HWY WB over Onion Creek in Montgomery 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 2,627 vehicles a day, roughly 11% of them trucks, projected to reach 2,680 by 2044. The structure is 293 ft (89.3 m) long and 42 ft wide. If it were closed, the detour would be 1.2 mi (2 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 | 7 Good | Some minor problems. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US166 HWY WB over Onion Creek built?
It was built in 1970, making it 55 years old in 2025.
What condition is US166 HWY WB over Onion Creek 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 March 2023.
How much traffic does US166 HWY WB over Onion Creek carry?
About 2,627 vehicles per day (2023 count), of which roughly 11% are trucks.
How long is US166 HWY WB over Onion Creek?
The structure is 293 ft (89.3 m) long with a longest span of 80 ft (24.4 m) and a deck 42 ft wide.
Who owns US166 HWY WB over Onion Creek?
It is owned by the State Highway Agency.