Yes. As with the note above that points out that big rocks create big cushions and small rocks create small cushions -- the same might be said of big and small rivers.

The reason is streamflow. Since bigger rivers tend to have bigger, heavier flows -- it stands to reason that more water rushing faster at a -- for instance -- a big river boulder, will rebound more significantly than slower, softer flows will and will thus create a bigger cushion.

So, in short -- size matters. Big flows and big obstructions cause big cushions, small flows and small obstructions create small cushions. Mix and match and get everything in between.