Okay fellas, I was able to make it back up to the site and have some info for you and some eye candy.
Info: The pond is 6-7ft deep.
Observation #1: When reelingin my rock-on-a-string-with-trash-as-a-float setup to measure the depth, a trail of bubbles followed the rock dragging the bottom of the pond which tells me there are som sort of bubbles on the bottom of the pond. (I observed an obvious delay as they rose to the surface, so it did not have anything to do with the string.)
Observation #2: The island of grass in the third photo circulates around the pond as the wind blows, and seemed to be centered in the deeper part of the pond but does not reach the shore. (but gets within 10 ft of the dam) I would guess that has +10ft long roots that give it quite a bit of working room for it to go around and around in the pond like that.
Observation #3: I also observed what looked like a miniture eel. That's the only sign of life in the water that I have seen:

Depth at the dam 7ft

Depth toward the middle of the pond 6ft

Upper pond on right, lower pond on left:

Eye candy:



View from upper pond of lightining behind a volcano:

Your comments?