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Eagle River Falls, forming the boundary between the Portage Lake Volcanics and the Copper Harbor Conglomerate, Keweenaw Co.

Eagle River Falls, forming the boundary between the Portage Lake Volcanics and the Copper Harbor Conglomerate, Keweenaw Co.

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guest   [Aug 04, 2006 at 10:26 PM]
Is the hole just below the dam natural or man made?
guest   [Aug 06, 2006 at 10:51 PM]
That is a natural feature called a pothole. It is formed when a boulder is sitting there and water flows around it. The flow of water forms eddies and other strong currents that move the boulder around in a circular motion and carves out the bedrock underneath, leaving a depression or pothole in the bedrock where the boulder once was.

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