James I see you have a 3 acre 15' deep spring fed pond, it wouldn't cost much to experiment with small numbers of trout now to see if they can survive the summer.
Rainbows would be the easiest to get and maybe some brookies and tigers if available. Put in about 50 total and see if they make it thru the summer.
Addition helpful things would be aeration, and also a surface fountain pump, running both on a thermostat set for cooler days and nights.
My pond is supplied with 110gpm piped in from a cool stream which is well oxygenated from fast movement over the rocks.
The near surface temps. will get into the 70's in the summer but the temp. below 5 ft never gets above the 60's.
