Mo 21 S over Or 21
GoodJefferson County, Missouri · S 22 T 43 N R 5 E · Structure no. 2660
- Built
- 1978
- 47 years old
- Condition
- Good
- inspected November 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete Continuous
- Length
- 216 ft
- 3 main spans
- Daily traffic
- 16,242
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
Mo 21 S over Or 21 is a prestressed concrete continuous stringer/multi-beam or girder carrying Mo 21 S over Or 21 in Jefferson County, Missouri. It was built in 1978, so it is 47 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 16,242 vehicles a day, roughly 6% of them trucks, projected to reach 30,048 by 2044. The structure is 216 ft (65.8 m) long and 43 ft wide. If it were closed, the detour would be 1.9 mi (3 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 21 S over Or 21 built?
It was built in 1978, making it 47 years old in 2025.
What condition is Mo 21 S over Or 21 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 November 2024.
How much traffic does Mo 21 S over Or 21 carry?
About 16,242 vehicles per day (2024 count), of which roughly 6% are trucks.
How long is Mo 21 S over Or 21?
The structure is 216 ft (65.8 m) long with a longest span of 74 ft (22.7 m) and a deck 43 ft wide.
Who owns Mo 21 S over Or 21?
It is owned by the State Highway Agency.