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At the foot of Dry Falls. Offers camping and lakefront shoreline. During the last ice age, Dry Falls occasionally carried more water by volume than all the rivers of the world combined (known as the Missoula Flood).
These caves on the Grand Coulee were formed by water erosion on volcanic rock, which makes them geologically interesting.
A 27 mi reservoir in the northern portion of the Grand Coulee, a formerly dry coulee near the Columbia River, formed by the Missoula Floods.