Horace Sykes look north through the Lower Grand Coulle from the south shore of Alkali Lake. HIs prospect is about half way between the community of Soap Lake and Dry Falls. It is roughly ten miles to each. Washington State Route 17 follows the coulee, for an adventure in cliff watching. The six larger lakes that string along these twenty miles are, from south to north, Soap, Lenore (the longest of them), Alkali, Blue, Park, and Dry Falls Lake. The last at 1511 feet snuggles below Dry Falls, which are about 300 feet high. Alkali lake has an “average” elevation of 1090 feet, which puts it about 1300 feet below the farmland to the east. The Grand Coullee – and much else in eastern Washington – is a creation of the Missoula Floods. As I understand it, the coullee was carved by the great flood from south to north, so that the Dry Falls began forming southwest of Ephrata and then eroded its way north.