Mo 21 N over Sandy CR
FairJefferson County, Missouri · S 23 T 41 N R 4 E · Structure no. 31519
- Built
- 2006
- 19 years old
- Condition
- Fair
- inspected December 2024
- Type
- Tee Beam
- Prestressed Concrete Continuous
- Length
- 332 ft
- 3 main spans
- Daily traffic
- 9,871
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
Mo 21 N over Sandy CR is a prestressed concrete continuous tee beam carrying Mo 21 N over Sandy CR in Jefferson County, Missouri. It was built in 2006, so it is 19 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 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 9,871 vehicles a day, roughly 3% of them trucks, projected to reach 18,261 by 2044. The structure is 332 ft (101.1 m) long and 41 ft wide. If it were closed, the detour would be 1.2 mi (2 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 | 7 Good | Some minor problems. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| 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 N over Sandy CR built?
It was built in 2006, making it 19 years old in 2025.
What condition is Mo 21 N over Sandy CR 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 December 2024.
How much traffic does Mo 21 N over Sandy CR carry?
About 9,871 vehicles per day (2024 count), of which roughly 3% are trucks.
How long is Mo 21 N over Sandy CR?
The structure is 332 ft (101.1 m) long with a longest span of 110 ft (33.5 m) and a deck 41 ft wide.
Who owns Mo 21 N over Sandy CR?
It is owned by the State Highway Agency.