answersLogoWhite

0

Grand Coulee Dam is named for the Grand Coulee, an ancient dry riverbed along the Columbia River. It is actually a glacially-eroded watercourse from vast and sudden prehistoric floods of water and ice, which flowed west from the extinct Lake Mizzoula in Montana, beginning about 18000 years ago.

The lake behind the dam was named Franklin Delano Roosevelt Lake (FDR Lake) for the US President who approved its construction.

User Avatar

Wiki User

12y ago

What else can I help you with?