Crossbedded boulder-gravels...

dominate the south wall of an aggregate pit west of Spokane and north of Airway Heights, indicating transport from east to west (left to right) during Pleistocene-age outburst floods (click to enlarge):

I snapped the image early today while doing field work for a small consulting project on the mine property, the goal of which is to determine the distance that separates the seasonal high groundwater surface relative to the elevation of the pit floor.