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.
Looked under a rock, and there was a network of strands (fungus)? Water droplets were on them, clearly not dew, perhaps snow melt.
Water beetle with an air bubble for breathing. Dytiscidae?
A collection of air bubbles under the water. The nest of the water beetle?
Some kind of nymph. Perhaps dragonfly nymph, Dytiscid beetle nymph, or hellgrammite (dobsonfly larva):
Millipede under water:
Lithobiomorpha centipede, perhaps Lithobius genus: