US 61 S over Is 55
FairPosted for loadJefferson County, Missouri · S 1906 T 40 N R 6 E · Structure no. 1481
- Built
- 1969
- 56 years old, rebuilt 1984
- Condition
- Fair
- inspected November 2024
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 367 ft
- 4 main spans
- Daily traffic
- 6,171
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
US 61 S over Is 55 is a steel continuous stringer/multi-beam or girder carrying US 61 S over Is 55 in Jefferson County, Missouri. It was built in 1969 and reconstructed in 1984, so it is 56 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 6 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 6,171 vehicles a day, roughly 9% of them trucks, projected to reach 11,108 by 2044. The structure is 367 ft (111.9 m) long and 43 ft wide. If it were closed, the detour would be 6.8 mi (11 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. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US 61 S over Is 55 built?
It was built in 1969, making it 56 years old in 2025. It was reconstructed in 1984.
What condition is US 61 S over Is 55 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 November 2024.
How much traffic does US 61 S over Is 55 carry?
About 6,171 vehicles per day (2024 count), of which roughly 9% are trucks.
How long is US 61 S over Is 55?
The structure is 367 ft (111.9 m) long with a longest span of 121 ft (36.9 m) and a deck 43 ft wide.
Who owns US 61 S over Is 55?
It is owned by the State Highway Agency.