As the glaciers began to recede, the melt water had nowhere to go, blocked by a lobe of the glacier butted up against the Baraboo Hills, which are made of indestructible quartzite. The water backed up for 4,0000 years forming Glacial Lake Wisconsin, which grew to 70 miles wide, 70 miles long and 130 feet deep. About 14,000 years ago, under such pressure the ice dam let loose, sending a raging torrent through the region. The rushing water sculpted the unique cliffs of the Dells and carved out the deep narrow canyons in a matter of days.
Photographed August 7, 2015.
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