Stocking question

I guess that would depend on temprature. I would stock it with blue gill and bass maybe. Some frogs and probably a few smaller forage fish too. Maybe look into some etymological samples to jump start some nice bugs too.
 

No one is thinking any trout?
 
Would they survive?

a relative of mine owns a pond about the same size as the one your talking about.  their pond is fed by a small stream, most of the pond is covered with lilly pads, the water seems to stay cool even in the summer.  this pond is also at a somewhat high elevation so that also helps keep the water temp down a little.  they stock the pond every now and then with trout and the trout seem to do pretty well, even on hot summer days the trout will be active.  there is also a good population of carp, bluegills, bass, and perch in this pond with the occasional crappie and bullhead.
 
if i were you i'd think about stocking channel cats, they get big but usually wont reproduce in a small pond so you dont have to worry about them taking over the pond.  bullheads can take over a small pond and they dont really get big at all so it would be a waste to stock them.  bluegills, perch, and bass will usually do well in any small body of water.  i would start off though by stocking plenty of baitfish to provide forage for the bigger fish.

Not sure about average JUly temps, as this pond is on a 600 acre trac of ground my and buddy just leased.
as far as being established, not sure what that means. But as of right now there is not lilly pads, or anything of the such in the pond. As for a pump or fountian that is pretty much not an option, as there is no electric for miles. And as for the average depth, it looks to be about 6ft. but then again looking in to water, can be hard to tell some times, but the water stays crystal clear even after hard rains.

As far a plunge pool that could be done. We have permission, with our lease, to do anything we want with the ground. As long as it's legal of course. LOL.....