This is the link . This is the link . After sloshing across the plateau, the water moved west through the narrow Columbia Gorge, then backed up into Oregon's Willamette Valley above Portland, reaching depths up to 400 feet before finally emptying into the Pacific Ocean.
Estimates range from several weeks to an astonishing two days.
In the 1920s, when J. Harlen Bretz of the University of Chicago first proposed his theory of a great flood based on his personal exploration of the region, he was ridiculed. The columnlike basalt walls look like monstrous black honeycombs, as tall as 900 feet. The water gouged the floor of the coulee, ripping great hunks of volcanic basalt down to the bedrock. The current hot question in anthropological circles is whether early humans were in the area to witness the last great flood. Current evidence shows that the area was inhabited a little more than 10,000 years ago, only two millenniums shy of the last flood.