M 4 over Willow River
PoorPosted for loadPine County, Minnesota · 0.3 MI N of JCT Csah 61 · Structure no. 2683
- Built
- 1924
- 101 years old
- Condition
- Poor
- inspected September 2024
- Type
- Girder and Floorbeam System
- Concrete
- Length
- 33 ft
- 1 main span
- Daily traffic
- 80
- 2001 count
- Owner
- City
- City or Municipal Highway Agency
About this bridge
M 4 over Willow River is a concrete girder and floorbeam system carrying M 4 over Willow River in Pine County, Minnesota. It was built in 1924, so it is 101 years old, older than the Minnesota average of 38.5 years.
The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.
It carries about 80 vehicles a day, projected to reach 80 by 2029. The structure is 33 ft (10 m) long and 24 ft wide. If it were closed, the detour would be 1.2 mi (2 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| 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 Willow River built?
It was built in 1924, making it 101 years old in 2025.
What condition is M 4 over Willow River in?
The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in September 2024.
How much traffic does M 4 over Willow River carry?
About 80 vehicles per day (2001 count).
How long is M 4 over Willow River?
The structure is 33 ft (10 m) long with a longest span of 30 ft (9.1 m) and a deck 24 ft wide.
Who owns M 4 over Willow River?
It is owned by the City or Municipal Highway Agency.