Macdiarmid Tunnel

The Macdiarmid Tunnel, also known as Jumbo’s Cove Tunnel, is located just south of the communities of Macdiarmid/Rocky Bay First Nation (more properly Biinjitiwabik Zaaging Anishnabek First Nation) at Milepost 37.1. It is the largest tunnel in the Thunder Bay area, at 1000 feet long. The two portals and portions of the southern end are encased with concrete and the unfinished appearance suggests more work was intended to be done.


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