US 61 S over Is 70
FairPosted for loadSt. Charles County, Missouri · S 30 T 47 N R 2 E · Structure no. 6390
- Built
- 1971
- 54 years old, rebuilt 2003
- Condition
- Fair
- inspected September 2023
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 246 ft
- 4 main spans
- Daily traffic
- 26,120
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
US 61 S over Is 70 is a steel continuous stringer/multi-beam or girder carrying US 61 S over Is 70 in St. Charles County, Missouri. It was built in 1971 and reconstructed in 2003, so it is 54 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 26,120 vehicles a day, roughly 5% of them trucks, projected to reach 44,404 by 2044. The structure is 246 ft (75 m) long and 53 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US 61 S over Is 70 built?
It was built in 1971, making it 54 years old in 2025. It was reconstructed in 2003.
What condition is US 61 S over Is 70 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 2023.
How much traffic does US 61 S over Is 70 carry?
About 26,120 vehicles per day (2024 count), of which roughly 5% are trucks.
How long is US 61 S over Is 70?
The structure is 246 ft (75 m) long with a longest span of 79 ft (24.1 m) and a deck 53 ft wide.
Who owns US 61 S over Is 70?
It is owned by the State Highway Agency.