Most life was wiped out, and the creatures that did survive huddled in small pockets of open water, where hot springs continued to bubble up. This was Snowball Earth â a deep freeze that began around 715 million years ago and held Earth in its icy grip for a good 120 million years. There are no other comparable glacial periods on Earth.
Lake Barkley Lake Levels. The lake's level is fluctuated from summer to winter for flood control purposes. Summer pool (359 ft. sea level) is normally reached by May 1. The water level begins dropping gradually on July 1, and winter pool (354 ft.) is reached by December 1.
The area of the park includes over a million acres of land or 1,218,375.54 acres (493,077 hectares 1,904 square miles, 4,931 km 2) to be exact. The elevation of the Colorado River, at the bottom of the Canyon, averages out to around 2,200 feet (670 meters).