Bedrock slabs

From the prior ledge/waves, bedrock lines the shores and riverbottom. At this point, a significant hump of bedrock rises in the river-right half of the flow. At very low flows, this will squeeze all flow to the left. At somewhat higher (moderate) flows, it may create some wave features here. At high flow, it may likely make very little disturbance. Immediately downstream, a very minor ledge may also create a wave at some flows.