Mo 21 S over Darr Valley
FairReynolds County, Missouri · S 32 T 30 N R 1 E · Structure no. 1405
- Built
- 1967
- 58 years old
- Condition
- Fair
- inspected November 2024
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 190 ft
- 3 main spans
- Daily traffic
- 1,959
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
Mo 21 S over Darr Valley is a steel continuous stringer/multi-beam or girder carrying Mo 21 S over Darr Valley in Reynolds County, Missouri. It was built in 1967, so it is 58 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 5 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 1,959 vehicles a day, roughly 12% of them trucks, projected to reach 2,939 by 2044. The structure is 190 ft (57.9 m) long and 33 ft wide. If it were closed, the detour would be 72.1 mi (116 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Mo 21 S over Darr Valley built?
It was built in 1967, making it 58 years old in 2025.
What condition is Mo 21 S over Darr Valley 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 November 2024.
How much traffic does Mo 21 S over Darr Valley carry?
About 1,959 vehicles per day (2024 count), of which roughly 12% are trucks.
How long is Mo 21 S over Darr Valley?
The structure is 190 ft (57.9 m) long with a longest span of 72 ft (21.9 m) and a deck 33 ft wide.
Who owns Mo 21 S over Darr Valley?
It is owned by the State Highway Agency.