History
Keweenaw Waterway in MichiganThe waterway was dredged in the 1860s, extending a small river previously used by natives for transportation and fishing. The effort was a joint venture between the United States Government and several mining corporations. Legislation for construction of the canal was passed in 1861. This legislation created the Portage Lake & Lake Superior Canal Co. The company began construction of the canal in September 1868. The canal starts at the mouth of Boston Creek and continues on to Lake Superior.
The expanded canal allowed freighters to haul copper from the rich copper mines of the Keweenaw Peninsula out through Lake Superior to larger cities. It also enabled supply boats and freighters to reach the cities of Houghton and Hancock, which supplied goods to most of Michigan's copper region. The expanded canal and shipping lane has a depth of 25 feet (7.6 m), deeper in some locations. As the waterway connects Lake Superior to itself, there are no locks needed. The local mines' stamp mills dumped large quantities of stamp sand (containing traces of copper and chemical leaching agents) into the waterway, causing significant environmental damage near the sand dumps. Stamp mills on the waterway included the Old Atlantic, old Quincy, Pewabic, old Franklin, and the Isle Royale mills.
The area north of the waterway is known locally as Copper Island, because the waterway separates the northern part of the Keweenaw Peninsula from the mainland.
The only land route across the waterway is US 41/M-26 across the Portage Lake Lift Bridge.
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