Wanttohuntmore - the wasteways are irrigation runoff that flows back into the various impoundments in the Columbia Basin - Potholes has three, Frenchman Hills, Winchester, and Lind Coulee. Crab Creek also flows in out of Moses.
I've fished the main lake for trout quite a bit, but I know that they will head up into the wasteways to spawn in the spring, was hoping to go tie into a few for some C&R action.