About 10,000 years ago, as the last Ice Age glaciers melted, Glacial Lake Wisconsin covered all but the tallest bluffs here. Its water level varied from 60 to 80 feet deep and spread across a vast plain 920 to 940 feet above sea level. Wildcat Bluff, Bee Bluff, Camel Bluff, and Ragged Rock rose from this landscape in different ways. Ragged Rock, conical in shape, had lost the harder limestone cap that protected the tops of the other bluffs from erosion, and at 80 feet tall it was only partially visible at water level. Wildcat Bluff, at 140 feet tall, and Camel Bluff, at 170 feet tall, stood as high rocky islands in the lake. Bee Bluff, at 60 feet tall, was probably under water during much of the lake era, and the low area between the humps of Camel Bluff was also under water during the lake's 300 years of existence.