Mo 109 S over Mo 100
GoodSt. Louis County, Missouri · S 2 T 44 N R 3 E · Structure no. 2387
- Built
- 1974
- 51 years old, rebuilt 2019
- Condition
- Good
- inspected July 2024
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 250 ft
- 4 main spans
- Daily traffic
- 21,668
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
Mo 109 S over Mo 100 is a steel continuous stringer/multi-beam or girder carrying Mo 109 S over Mo 100 in St. Louis County, Missouri. It was built in 1974 and reconstructed in 2019, so it is 51 years old, older than the Missouri average of 45.1 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 21,668 vehicles a day, roughly 3% of them trucks, projected to reach 30,335 by 2044. The structure is 250 ft (76.2 m) long and 47 ft wide. If it were closed, the detour would be 24.2 mi (39 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Mo 109 S over Mo 100 built?
It was built in 1974, making it 51 years old in 2025. It was reconstructed in 2019.
What condition is Mo 109 S over Mo 100 in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in July 2024.
How much traffic does Mo 109 S over Mo 100 carry?
About 21,668 vehicles per day (2024 count), of which roughly 3% are trucks.
How long is Mo 109 S over Mo 100?
The structure is 250 ft (76.2 m) long with a longest span of 86 ft (26.2 m) and a deck 47 ft wide.
Who owns Mo 109 S over Mo 100?
It is owned by the State Highway Agency.