If you take a short exposure, it seems to freeze the waves, and often seems static. If you take a long exposure, it blurs all the movement and ends looking rather static, too. These exposures are about half a second or so, and to me they bring out the action and look more dynamic. I really need to use a tripod, and get a neutral density filter, though.
Stonefly! This is very encouraging because stoneflies are very sensitive indicators of water quality. If you have stoneflies (and we had them in profusion on Massapoag brook), the water is pretty decent.