Mo 21 S over Gravois CR
GoodPosted for loadSt. Louis County, Missouri · S 2995 T 44 N R 6 E · Structure no. 947
- Built
- 1969
- 56 years old, rebuilt 1993
- Condition
- Good
- inspected July 2024
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 250 ft
- 3 main spans
- Daily traffic
- 18,182
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
Mo 21 S over Gravois CR is a steel continuous stringer/multi-beam or girder carrying Mo 21 S over Gravois CR in St. Louis County, Missouri. It was built in 1969 and reconstructed in 1993, so it is 56 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. Its operating status is: posted for load restriction.
It carries about 18,182 vehicles a day, roughly 5% of them trucks, projected to reach 25,455 by 2044. The structure is 250 ft (76.2 m) long and 75 ft wide. If it were closed, the detour would be 0.6 mi (1 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. |
| Channel and channel protection | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Mo 21 S over Gravois CR built?
It was built in 1969, making it 56 years old in 2025. It was reconstructed in 1993.
What condition is Mo 21 S over Gravois CR 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 21 S over Gravois CR carry?
About 18,182 vehicles per day (2024 count), of which roughly 5% are trucks.
How long is Mo 21 S over Gravois CR?
The structure is 250 ft (76.2 m) long with a longest span of 96 ft (29.2 m) and a deck 75 ft wide.
Who owns Mo 21 S over Gravois CR?
It is owned by the State Highway Agency.