Mo 21 S over Cannon Mine
FairWashington County, Missouri · S 28 T 39 N R 3 E · Structure no. 5645
- Built
- 1932
- 93 years old
- Condition
- Fair
- inspected June 2024
- Type
- Culvert
- Concrete Continuous
- Length
- 33 ft
- 3 main spans
- Daily traffic
- 5,009
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
Mo 21 S over Cannon Mine is a concrete continuous culvert carrying Mo 21 S over Cannon Mine in Washington County, Missouri. It was built in 1932, so it is 93 years old, older 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 5,009 vehicles a day, roughly 9% of them trucks, projected to reach 9,517 by 2044. The structure is 33 ft (10.1 m) long and 38 ft wide. If it were closed, the detour would be 21.1 mi (34 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 |
|---|---|---|
| Channel and channel protection | 7 Good | Some minor problems. |
| Culvert | 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 Cannon Mine built?
It was built in 1932, making it 93 years old in 2025.
What condition is Mo 21 S over Cannon Mine 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 June 2024.
How much traffic does Mo 21 S over Cannon Mine carry?
About 5,009 vehicles per day (2024 count), of which roughly 9% are trucks.
How long is Mo 21 S over Cannon Mine?
The structure is 33 ft (10.1 m) long with a longest span of 10 ft (3 m) and a deck 38 ft wide.
Who owns Mo 21 S over Cannon Mine?
It is owned by the State Highway Agency.