M-66 over Muskegon River
PoorOsceola County, Michigan · 3.2 MI N of US-10 · Structure no. 000000000008587
- Built
- 1940
- 85 years old, rebuilt 1994
- Condition
- Poor
- inspected July 2024
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 220 ft
- 4 main spans
- Daily traffic
- 1,990
- 2007 count
- Owner
- State
- State Highway Agency
About this bridge
M-66 over Muskegon River is a steel stringer/multi-beam or girder carrying M-66 over Muskegon River in Osceola County, Michigan. It was built in 1940 and reconstructed in 1994, so it is 85 years old, older than the Michigan average of 48.3 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: open, would be posted or closed except for temporary shoring.
It carries about 1,990 vehicles a day, roughly 7% of them trucks, projected to reach 2,912 by 2018. The structure is 220 ft (67 m) long and 39 ft wide. If it were closed, the detour would be 6.2 mi (10 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 | 7 Good | Some minor problems. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| 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 M-66 over Muskegon River built?
It was built in 1940, making it 85 years old in 2025. It was reconstructed in 1994.
What condition is M-66 over Muskegon 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 July 2024.
How much traffic does M-66 over Muskegon River carry?
About 1,990 vehicles per day (2007 count), of which roughly 7% are trucks.
How long is M-66 over Muskegon River?
The structure is 220 ft (67 m) long with a longest span of 55 ft (16.7 m) and a deck 39 ft wide.
Who owns M-66 over Muskegon River?
It is owned by the State Highway Agency.