T 355 over Big Cobb River
FairBlue Earth County, Minnesota · 0.2 MI S of JCT Csah 10 · Structure no. 07517
- Built
- 1967
- 58 years old
- Condition
- Fair
- inspected October 2024
- Type
- Channel Beam
- Prestressed Concrete
- Length
- 125 ft
- 4 main spans
- Daily traffic
- 36
- 1969 count
- Owner
- Town / Township
- Town or Township Highway Agency
About this bridge
T 355 over Big Cobb River is a prestressed concrete channel beam carrying T 355 over Big Cobb River in Blue Earth County, Minnesota. It was built in 1967, so it is 58 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 36 vehicles a day, projected to reach 36 by 2029. The structure is 125 ft (38.1 m) long and 26 ft wide. 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 |
|---|---|---|
| Deck | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was T 355 over Big Cobb River built?
It was built in 1967, making it 58 years old in 2025.
What condition is T 355 over Big 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 October 2024.
How much traffic does T 355 over Big Cobb River carry?
About 36 vehicles per day (1969 count).
How long is T 355 over Big Cobb River?
The structure is 125 ft (38.1 m) long with a longest span of 31 ft (9.5 m) and a deck 26 ft wide.
Who owns T 355 over Big Cobb River?
It is owned by the Town or Township Highway Agency.