Mo 109 S over Meramec Rvr
FairSt. Louis County, Missouri · S 12 T 43 N R 3 E · Structure no. 2539
- Built
- 1972
- 53 years old, rebuilt 2003
- Condition
- Fair
- inspected July 2024
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 972 ft
- 3 main spans
- Daily traffic
- 13,313
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
Mo 109 S over Meramec Rvr is a steel continuous stringer/multi-beam or girder carrying Mo 109 S over Meramec Rvr in St. Louis County, Missouri. It was built in 1972 and reconstructed in 2003, so it is 53 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.
It carries about 13,313 vehicles a day, roughly 5% of them trucks, projected to reach 18,638 by 2044. The structure is 972 ft (296.3 m) long and 47 ft wide. If it were closed, the detour would be 18 mi (29 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. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Mo 109 S over Meramec Rvr built?
It was built in 1972, making it 53 years old in 2025. It was reconstructed in 2003.
What condition is Mo 109 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 July 2024.
How much traffic does Mo 109 S over Meramec Rvr carry?
About 13,313 vehicles per day (2024 count), of which roughly 5% are trucks.
How long is Mo 109 S over Meramec Rvr?
The structure is 972 ft (296.3 m) long with a longest span of 130 ft (39.6 m) and a deck 47 ft wide.
Who owns Mo 109 S over Meramec Rvr?
It is owned by the State Highway Agency.