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Same out here in Idaho and Montana with the Cordilleran Ice Sheet...

About 12,000 years ago, the valleys of western Montana lay beneath a lake nearly 2,000 feet deep. Glacial Lake Missoula formed as the Cordilleran Ice Sheet dammed the Clark Fork River just as it entered Idaho. The rising water behind the glacial dam weakened it until water burst through in a catastrophic flood that raced across Idaho, Oregon, and Washington toward the Pacific Ocean. Thundering waves and chunks of ice tore away soils and mountainsides, deposited giant ripple marks, created the scablands of eastern Washington and carved the Columbia River Gorge. Over the course of centuries, Glacial Lake Missoula filled and emptied in repeated cycles, leaving its story embedded in the land.
The Missoula floods (aka Spokane floods or Bretz floods) were cataclysmic glacial lake outburst floods that swept periodically across eastern Washington and down the Columbia River Gorge at the end of the last ice age. These floods were the result of periodic sudden ruptures of the ice dam on the Clark Fork River that created Glacial Lake Missoula. After each ice dam rupture, the waters of the lake would rush down the Clark Fork and the Columbia River, flooding much of eastern Washington and the Willamette Valley in western Oregon. After the lake drained, the ice would reform, creating Glacial Lake Missoula again.
Flood Facts
The ice dam was over 2000 feet tall.
Glacial Lake Missoula was as big as Lakes Erie and Ontario combined.
The flood waters ran with the force equal to 60 Amazon Rivers.
Car-sized boulders embedded in ice floated some 500 miles; they can still be seen today!
There is no evidence of fish in the glacial lake, but there may have been in the tributaries
No human relics have been found but native oral history suggests people may have witnessed the floods.

To this day, we still see lots of evidence of the Cordilleran Ice Sheet and the Missoula Floods here in North Idaho.

What might have caused those enormous ice dams to melt and collapse, then reform, collapse again, reform again, over centuries?

This is staggering. All caused by the warming at the end of the last Ice Age...

After J.T. Pardee studied the canyon of the Flathead River (100 years ago), he estimated that flood waters in excess of 45 miles per hour would be required to roll the largest of the boulders moved by the flood. He estimated the water flow was 9 cubic miles per hour, more than the combined flow of every river in the world. More recent estimates place the flow rate at ten times the flow of all current rivers combined. The flow from the Missoula Floods was one to ten times the flow rate of all the rivers in the world combined!

All caused by global warming at the end of the last Ice Age.

Everybody should ask their climate kook acquaintances about the cause of that.

Have you ever been to the Great Lakes area? It’s really something to stand on a giant sand dune witnessing the curve of the Earth and watch the sunset while contemplating the Pleistocene Epoch only a 100 great grandmothers ago and ice a mile thick.

I get the left and their control mongering to the masses - it’s just one more thing the commies do but the amount of people that believe this nonsense they put out is staggering. It is proof that cutting out basic geology and particularly astronomy in early education (like I got in the 60’s) is what is allowing these type of hoaxes to continue.