Mn 30 over Big Cobb River
GoodBlue Earth County, Minnesota · 5.2 MI SE of Mapleton · Structure no. 9393
- Built
- 1958
- 67 years old
- Condition
- Good
- inspected July 2023
- Type
- Slab
- Concrete Continuous
- Length
- 93 ft
- 3 main spans
- Daily traffic
- 443
- 2022 count
- Owner
- State
- State Highway Agency
About this bridge
Mn 30 over Big Cobb River is a concrete continuous slab carrying Mn 30 over Big Cobb River in Blue Earth County, Minnesota. It was built in 1958, so it is 67 years old, older than the Minnesota average of 38.5 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 443 vehicles a day, roughly 29% of them trucks, projected to reach 475 by 2042. The structure is 93 ft (28.4 m) long and 47 ft wide. If it were closed, the detour would be 3.1 mi (5 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Mn 30 over Big Cobb River built?
It was built in 1958, making it 67 years old in 2025.
What condition is Mn 30 over Big Cobb River in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in July 2023.
How much traffic does Mn 30 over Big Cobb River carry?
About 443 vehicles per day (2022 count), of which roughly 29% are trucks.
How long is Mn 30 over Big Cobb River?
The structure is 93 ft (28.4 m) long with a longest span of 31 ft (9.4 m) and a deck 47 ft wide.
Who owns Mn 30 over Big Cobb River?
It is owned by the State Highway Agency.