The most recent epoch of flooding lasted from ~20 to ~15 ka BP, and occurred when the Cordilleran Ice Sheet (CIS) was near its maximum extent. At this time, the Okanogan Lobe and Purcell Trench Lobe ...

While glacial lake outburst floods can be catastrophic in populated ... At the end of the last Ice Age, Lake Missoula had an outburst that was 2,500 times larger than the recent Catalina event.

Geologists believe these erratics arrived inside icebergs caught in a Glacial Lake Missoula flood. When the bergs grounded and melted here, the rocks were left high and dry, hundreds of miles from ...