Mo 109 S over Flat CR Bike Path
FairPosted for loadSt. Louis County, Missouri · S 2071 T 43 N R 3 E · Structure no. 3505
- Built
- 1987
- 38 years old
- Condition
- Fair
- inspected July 2024
- Type
- Tee Beam
- Prestressed Concrete Continuous
- Length
- 118 ft
- 3 main spans
- Daily traffic
- 18,408
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
Mo 109 S over Flat CR Bike Path is a prestressed concrete continuous tee beam carrying Mo 109 S over Flat CR Bike Path in St. Louis County, Missouri. It was built in 1987, so it is 38 years old, younger 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 18,408 vehicles a day, roughly 5% of them trucks, projected to reach 25,771 by 2044. The structure is 118 ft (36 m) long and 86 ft wide. If it were closed, the detour would be 5 mi (8 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Mo 109 S over Flat CR Bike Path built?
It was built in 1987, making it 38 years old in 2025.
What condition is Mo 109 S over Flat CR Bike Path 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 Flat CR Bike Path carry?
About 18,408 vehicles per day (2024 count), of which roughly 5% are trucks.
How long is Mo 109 S over Flat CR Bike Path?
The structure is 118 ft (36 m) long with a longest span of 40 ft (12.1 m) and a deck 86 ft wide.
Who owns Mo 109 S over Flat CR Bike Path?
It is owned by the State Highway Agency.