Mackinac Auto Tunnel
Sector: Road • Location: Michigan, United States
Source: NewsBreak: Local News & Alerts
A proposed tunnel under the Straits of Mackinac to replace or supplement the Mackinac Bridge, allowing vehicle traffic to pass under the straits instead of over the bridge. The tunnel would be approximately 5 miles long, making it the longest tunnel in the United States if constructed.
- Status
- Prospective
- Sector
- Road, Bridge, Tunnel
- Location
- Michigan, United States of America
- Updated
- 22 Jul 2026
- Source
- NewsBreak: Local News & Alerts
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Project Information
Participants
| Not available for this record. |
Status
Original status | proposed |
Taiyo status | Prospective |
Taiyo last update | 2026-07-22 |
Contact
| Not available for this record. |
Description
Description | A proposed tunnel under the Straits of Mackinac to replace or supplement the Mackinac Bridge, allowing vehicle traffic to pass under the straits instead of over the bridge. The tunnel would be approximately 5 miles long, making it the longest tunnel in the United States if constructed. |
Original sector | Transportation |
Location
Country | United States of America (USA) |
State | Michigan |
Source
Source | NewsBreak: Local News & Alerts |
URL |
More Details
Record type | Project |
Sector | Road, Bridge, Tunnel |
Article published date | 2025-09-16 |
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