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  1. Duluth's St. Louis River bay in fall.

    The St. Louis River, Lake Superior's largest U.S. tributary, begins on Minnesota's Iron Range and creates a freshwater estuary as it flows into the lake.

  2. Paddling on the St. Louis River.

    Paddlers pass an outcropping along the St. Louis River.

  3. Fond du Lac dam on the St. Louis River.

    For paddlers, the Fond du Lac dam is the end of the line.

  4. A view of Duluth's Aerial Lift Bridge and St. Louis Bay.

    The St. Louis River widens into an estuary full of islands.

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