M 4 over Swan River
GoodMorrison County, Minnesota · 0.1 MI S of JCT Csah 12 · Structure no. 49535
- Built
- 1993
- 32 years old
- Condition
- Good
- inspected November 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 67 ft
- 1 main span
- Daily traffic
- 118
- 1993 count
- Owner
- City
- City or Municipal Highway Agency
About this bridge
M 4 over Swan River is a prestressed concrete stringer/multi-beam or girder carrying M 4 over Swan River in Morrison County, Minnesota. It was built in 1993, so it is 32 years old, younger 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 118 vehicles a day, roughly 5% of them trucks, projected to reach 118 by 2029. The structure is 67 ft (20.4 m) long and 35 ft wide. If it were closed, the detour would be 6.2 mi (10 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was M 4 over Swan River built?
It was built in 1993, making it 32 years old in 2025.
What condition is M 4 over Swan 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 November 2023.
How much traffic does M 4 over Swan River carry?
About 118 vehicles per day (1993 count), of which roughly 5% are trucks.
How long is M 4 over Swan River?
The structure is 67 ft (20.4 m) long with a longest span of 65 ft (19.8 m) and a deck 35 ft wide.
Who owns M 4 over Swan River?
It is owned by the City or Municipal Highway Agency.