The
Keweenaw Waterway is a partly natural, partly artificial waterway which cuts across the
Keweenaw Peninsula of
Michigan; it separates
Copper Island from the mainland. Parts of the waterway are variously known as the Keweenaw Waterway,
Portage Canal,
Portage Lake Canal,
Portage River,
Lily Pond,
Torch Lake, and
Portage Lake. The waterway connects to
Lake Superior at its north and south entries (upper and lower portage entry lighthouses), with sections known as Portage Lake and
Torch Lake in between. The primary tributary to Portage Lake is the
Sturgeon River.