Dusty Lake

Dusty Lake is a water filled pothole in Washington's Channeled Scab Lands. This fascinating landscape was formed quite differently than most scablands which are weathered and eroded gradually over 10's of thousands or millions of years. In Washington it happened near the end of the ice age, nearly all at once (geologically speaking at least), by around 40 incredible rushes of water over about 2,000 years released from periodic breaches to the giant ice dam that formed "Lake Missoula". The lake had a volume of about 1/2 of Lake Michigan, so the volume of water that would rush out each time the dam breached was unfathomable. The Dusty and Ancient Lakes potholes are now water filled because of human activities - farm irrigation seeps into them creating lakes.

Here is an amazing arial view - Ancient Lakes is on the left and Dusty Lake is on the right - http://hugefloods.com/Scablands.html