At the end of the last glacial maximum, great discharges of water from melting glaciers burst through sediment and ice dams to form the

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The Channeled Scablands in Washington State were formed by giant floods around 15,000 years ago, caused by melting glaciers during the last glacial maximum. These floods burst through sediment and ice dams, carving deep channels into the landscape and leaving behind distinctive rugged formations called coulees and scablands. The Rocky Mountains, Grand Canyon, and Chesapeake Bay were not formed by glacial floods.

At the End of the Last Glacial Maximum, Great Discharges