Mo 21 S over Meramec Rvr Crd Meramec
FairPosted for loadSt. Louis County, Missouri · S 13 T 43 N R 4 E · Structure no. 5881
- Built
- 1940
- 85 years old, rebuilt 2009
- Condition
- Fair
- inspected May 2023
- Type
- Truss - Thru
- Steel Continuous
- Length
- 648 ft
- 3 main spans
- Daily traffic
- 18,038
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
Mo 21 S over Meramec Rvr Crd Meramec is a steel continuous truss - thru carrying Mo 21 S over Meramec Rvr Crd Meramec in St. Louis County, Missouri. It was built in 1940 and reconstructed in 2009, so it is 85 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 18,038 vehicles a day, roughly 5% of them trucks, projected to reach 25,253 by 2044. The structure is 648 ft (197.5 m) long and 52 ft wide. If it were closed, the detour would be 14.9 mi (24 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 | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Mo 21 S over Meramec Rvr Crd Meramec built?
It was built in 1940, making it 85 years old in 2025. It was reconstructed in 2009.
What condition is Mo 21 S over Meramec Rvr Crd Meramec 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 May 2023.
How much traffic does Mo 21 S over Meramec Rvr Crd Meramec carry?
About 18,038 vehicles per day (2024 count), of which roughly 5% are trucks.
How long is Mo 21 S over Meramec Rvr Crd Meramec?
The structure is 648 ft (197.5 m) long with a longest span of 264 ft (80.5 m) and a deck 52 ft wide.
Who owns Mo 21 S over Meramec Rvr Crd Meramec?
It is owned by the State Highway Agency.