Is 55 S over Meramec Rvr
FairPosted for loadSt. Louis County, Missouri · S 403 T 43 N R 6 E · Structure no. 441
- Built
- 1964
- 61 years old, rebuilt 1993
- Condition
- Fair
- inspected June 2024
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 1,425 ft
- 5 main spans
- Daily traffic
- 63,036
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
Is 55 S over Meramec Rvr is a steel continuous stringer/multi-beam or girder carrying Is 55 S over Meramec Rvr in St. Louis County, Missouri. It was built in 1964 and reconstructed in 1993, so it is 61 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 63,036 vehicles a day, roughly 18% of them trucks, projected to reach 78,795 by 2044. The structure is 1,425 ft (434.3 m) long and 76 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 | 7 Good | Some minor problems. |
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| 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 Is 55 S over Meramec Rvr built?
It was built in 1964, making it 61 years old in 2025. It was reconstructed in 1993.
What condition is Is 55 S over Meramec Rvr 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 June 2024.
How much traffic does Is 55 S over Meramec Rvr carry?
About 63,036 vehicles per day (2024 count), of which roughly 18% are trucks.
How long is Is 55 S over Meramec Rvr?
The structure is 1,425 ft (434.3 m) long with a longest span of 185 ft (56.4 m) and a deck 76 ft wide.
Who owns Is 55 S over Meramec Rvr?
It is owned by the State Highway Agency.