Mo 21 S over Mill CR
FairIron County, Missouri · S 7 T 32 N R 3 E · Structure no. 5614
- Built
- 1932
- 93 years old
- Condition
- Fair
- inspected October 2023
- Type
- Culvert
- Concrete Continuous
- Length
- 34 ft
- 3 main spans
- Daily traffic
- 864
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
Mo 21 S over Mill CR is a concrete continuous culvert carrying Mo 21 S over Mill CR in Iron 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 864 vehicles a day, roughly 18% of them trucks, projected to reach 1,296 by 2044. The structure is 34 ft (10.4 m) long. If it were closed, the detour would be 46 mi (74 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| 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 Mill CR built?
It was built in 1932, making it 93 years old in 2025.
What condition is Mo 21 S over Mill 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 October 2023.
How much traffic does Mo 21 S over Mill CR carry?
About 864 vehicles per day (2024 count), of which roughly 18% are trucks.
How long is Mo 21 S over Mill CR?
The structure is 34 ft (10.4 m) long with a longest span of 10 ft (3 m).
Who owns Mo 21 S over Mill CR?
It is owned by the State Highway Agency.