provo level    

Provo level 14.5 – 13.5

As the outlet channel stabilized it cut down through the alluvium to the underlying bedrock. The lake level stabilized when it was even with the resistant rock at an altitude of 1445m (4740 ft) and covered 23,175 sq km (14,400 sq mi.) The lake remained at this level with water flowing out of the basin through Red Rock Pass, into the Snake River and eventually the Pacific Ocean for roughly a thousand years. With the end of the last major ice age, the lack of water flowing into the basin caused the beginning of the gradual decline in the lake level to its current levels.


This image shows the size and shape of the lake at the Provo stage, about 14.5 thousand to 13.5 thousand years ago.


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