M 20 over Cannon River
GoodLe Sueur County, Minnesota · 0.1 MI N of JCT Csah 14 · Structure no. 40508
- Built
- 1978
- 47 years old
- Condition
- Good
- inspected October 2024
- Type
- Tee Beam
- Prestressed Concrete
- Length
- 93 ft
- 2 main spans
- Daily traffic
- 500
- 1974 count
- Owner
- City
- City or Municipal Highway Agency
About this bridge
M 20 over Cannon River is a prestressed concrete tee beam carrying M 20 over Cannon River in Le Sueur 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 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 500 vehicles a day, projected to reach 500 by 2029. The structure is 93 ft (28.3 m) long and 45 ft wide. If it were closed, the detour would be 1.9 mi (3 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 M 20 over Cannon River built?
It was built in 1978, making it 47 years old in 2025.
What condition is M 20 over Cannon 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 October 2024.
How much traffic does M 20 over Cannon River carry?
About 500 vehicles per day (1974 count).
How long is M 20 over Cannon River?
The structure is 93 ft (28.3 m) long with a longest span of 45 ft (13.8 m) and a deck 45 ft wide.
Who owns M 20 over Cannon River?
It is owned by the City or Municipal Highway Agency.