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Looking back up at the head of Lost Lake and what would have been the falls.
http://www.lostlakeranch.com/ranch.htm
The creation of Lost Lake dates back into antiquity. Geologists estimate that 50,000 to 70,000 years ago, during one of the advance glacial advances, a large lake was created in the Great Falls area. Alternate melting and freezing caused vast quantities of water to flow from the lake. This overflow is said to have formed the Shonkin Sag where Lost Lake is located. The sag is nearly a mile wide and over 500 feet deep in places, too sizeable to be formed by a river.
http://www.lostlakeranch.com/ranch.htm
The creation of Lost Lake dates back into antiquity. Geologists estimate that 50,000 to 70,000 years ago, during one of the advance glacial advances, a large lake was created in the Great Falls area. Alternate melting and freezing caused vast quantities of water to flow from the lake. This overflow is said to have formed the Shonkin Sag where Lost Lake is located. The sag is nearly a mile wide and over 500 feet deep in places, too sizeable to be formed by a river.