US 61 N over Big CR
FairPosted for loadSt. Charles County, Missouri · S 28 T 48 N R 1 E · Structure no. 697
- Built
- 1961
- 64 years old
- Condition
- Fair
- inspected September 2024
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 322 ft
- 5 main spans
- Daily traffic
- 23,419
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
US 61 N over Big CR is a steel continuous stringer/multi-beam or girder carrying US 61 N over Big CR in St. Charles County, Missouri. It was built in 1961, so it is 64 years old, older than the Missouri average of 45.1 years.
The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.
It carries about 23,419 vehicles a day, roughly 20% of them trucks, projected to reach 39,812 by 2044. The structure is 322 ft (98.2 m) long and 33 ft wide. If it were closed, the detour would be 0.6 mi (1 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| 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 61 N over Big CR built?
It was built in 1961, making it 64 years old in 2025.
What condition is US 61 N over Big CR 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 61 N over Big CR carry?
About 23,419 vehicles per day (2024 count), of which roughly 20% are trucks.
How long is US 61 N over Big CR?
The structure is 322 ft (98.2 m) long with a longest span of 80 ft (24.4 m) and a deck 33 ft wide.
Who owns US 61 N over Big CR?
It is owned by the State Highway Agency.