This image is a close-up of the giant ripples on the West Bar near Crescent City on the Columbia River as showed on my previous entry. These giant ripples were created during the Ice Age Floods as the Columbia River flowed over the gravel bar. They are 35 feet high, spaced at 150 -200 feet apart. It is amazing what water can do!
How calm the Columbia River looks. Fifteen thousand years ago, during the Ice Age Floods, it wasn’t quite like this. At that time the Columbia was flowing at the top of the basalt cliffs seen in the distance. The West Bar shown in the middle of this image is comprised of gravel. rock, and other sediments. It was part of the backwater created as the Columbia raged toward the left and then back down through the gorge. The surface of the bar is covered with giant ripples around thirty feet high.
This image was taken above Crescent Bar looking southwest.
It is hard to comprehend how enormous the Missoula Ice Age Floods were. The edge of the bluff in the top left hand corner is approximately 200 feet high. The water level during the Missoula Floods was about 200 feet above the top of the mesa. The distance across the Drumheller Channels was 8-11 miles wide. The water is estimated to have moved through here at 50+ miles/hour. The landscape left behind is amazing. My mind wanders about contemplating what it must have been like.
This image was taken at the overlook off the main road running through the reserve.