Old HWY 21 S over Mo 21
FairPosted for loadJefferson County, Missouri · S 27 T 43 N R 5 E · Structure no. 2663
- Built
- 1987
- 38 years old
- Condition
- Fair
- inspected November 2024
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 343 ft
- 4 main spans
- Daily traffic
- 11,418
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
Old HWY 21 S over Mo 21 is a steel continuous stringer/multi-beam or girder carrying Old HWY 21 S over Mo 21 in Jefferson County, Missouri. It was built in 1987, so it is 38 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. Its operating status is: posted for load restriction.
It carries about 11,418 vehicles a day, roughly 5% of them trucks, projected to reach 19,411 by 2044. The structure is 343 ft (104.5 m) long and 47 ft wide. If it were closed, the detour would be 5 mi (8 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. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Old HWY 21 S over Mo 21 built?
It was built in 1987, making it 38 years old in 2025.
What condition is Old HWY 21 S over Mo 21 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 Old HWY 21 S over Mo 21 carry?
About 11,418 vehicles per day (2024 count), of which roughly 5% are trucks.
How long is Old HWY 21 S over Mo 21?
The structure is 343 ft (104.5 m) long with a longest span of 111 ft (33.8 m) and a deck 47 ft wide.
Who owns Old HWY 21 S over Mo 21?
It is owned by the State Highway Agency.