Foster Coulee, Glacial valley in Douglas County, Washington, United States.
Foster Coulee is a glacial valley in Douglas County featuring steep canyon walls and a deep ravine carved into the landscape. The valley floor follows East Foster Creek, while rock layers on the sides show how water and time shaped this formation.
This valley formed roughly 14,000 years ago when enormous amounts of water from Glacial Lake Columbia rushed through the area. The force of these floods carved the steep walls into the rock and created the landscape seen today.
The valley served as a travel route and hunting ground for Native American peoples long before settlers arrived. Descendants of these communities still recognize the place as important to their heritage.
State Route 17 runs through the area between Bridgeport and Coulee City, making the valley accessible by car. Plan your visit for spring or fall when the weather is mild and views of the walls are clearest.
This valley is home to the endangered Washington ground squirrel, a small rodent found nowhere else nearby. The area plays a role in efforts to prevent this rare animal from disappearing.
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