A second vote for the Elwha between the dams. The upper Elwha, with its mix of substrate sizes, is a piece of cake. But that section between the dams is mostly larger boulders because the dams block the renourishment of smaller sediments. Between rocking boulders and irregular shapes that aren't stabilized, I've barked my shins and dunked myself more on that section than anywhere else I've fished.
I've waded much of the water listed here, the Thompson would be at the tip top of my list. The rocks are more like boulders, and its like they are covered in snot, slime and then grease. The Thompson is cold in November!