A few clicks further up the line. The water is getting there, although I don't like it when water hits soil/rocks and there's a harsh separation. Using RT reflection helps on shore reflectivity, but takes ages, so in the latter versions I added some fake watery/foam remains just where the water hits the rock/soil.
I also didn't like the rocks. Smoothing before the rocks' layer wasn't an option to get the ground displacement out of the rocks, as the whole river disappeared then. I will smooth out the basic terrain instead, and add small displacements after the rock, inversely blended by the rocks themselves. If the small ground displacements are necessary anyway. I want to have mostly smooth rounded rocks in the water, so that's next. And some (more) large boulders at the sides. Regarding vegetation: I made some new grasses, tried the (fall) spruce, but I have to think of something else.... work to do.
Here are the latest iterations:
