Three Mile Road over Munuscong River
GoodMackinac County, Michigan · 9.2MI N of Hessel and M-1 · Structure no. 000000000005987
- Built
- 1978
- 47 years old
- Condition
- Good
- inspected October 2023
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete
- Length
- 112 ft
- 2 main spans
- Daily traffic
- 40
- 2015 count
- Owner
- County
- County Highway Agency
About this bridge
Three Mile Road over Munuscong River is a prestressed concrete box beam or girders - multiple carrying Three Mile Road over Munuscong River in Mackinac County, Michigan. It was built in 1978, so it is 47 years old, younger than the Michigan average of 48.3 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 40 vehicles a day, roughly 3% of them trucks, projected to reach 80 by 2035. The structure is 112 ft (34.1 m) long and 31 ft wide. If it were closed, the detour would be 3.7 mi (6 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 | 8 Very Good | No problems noted. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Three Mile Road over Munuscong River built?
It was built in 1978, making it 47 years old in 2025.
What condition is Three Mile Road over Munuscong 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 2023.
How much traffic does Three Mile Road over Munuscong River carry?
About 40 vehicles per day (2015 count), of which roughly 3% are trucks.
How long is Three Mile Road over Munuscong River?
The structure is 112 ft (34.1 m) long with a longest span of 56 ft (17 m) and a deck 31 ft wide.
Who owns Three Mile Road over Munuscong River?
It is owned by the County Highway Agency.