Csah 21 over Little Cobb River
FairBlue Earth County, Minnesota · 0.4 MI E of JCT Csah 53 · Structure no. 93307
- Built
- 1978
- 47 years old
- Condition
- Fair
- inspected November 2024
- Type
- Culvert
- Concrete
- Length
- 72 ft
- 4 main spans
- Daily traffic
- 34
- 2021 count
- Owner
- County
- County Highway Agency
About this bridge
Csah 21 over Little Cobb River is a concrete culvert carrying Csah 21 over Little Cobb River in Blue Earth County, Minnesota. It was built in 1978, so it is 47 years old, older than the Minnesota average of 38.5 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 34 vehicles a day, projected to reach 40 by 2041. The structure is 72 ft (21.9 m) long. If it were closed, the detour would be 3.1 mi (5 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 Csah 21 over Little Cobb River built?
It was built in 1978, making it 47 years old in 2025.
What condition is Csah 21 over Little Cobb River 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 Csah 21 over Little Cobb River carry?
About 34 vehicles per day (2021 count).
How long is Csah 21 over Little Cobb River?
The structure is 72 ft (21.9 m) long with a longest span of 14 ft (4.3 m).
Who owns Csah 21 over Little Cobb River?
It is owned by the County Highway Agency.