I've got a two acre pond in Southern NH about 15' deep it's spring and groundwater fed. We've got predominantly rainbows but some browns and brookies too. The key to getting trout to survive is a constant source of cool, oxygenated water. If you don't have that source then chances are they won't survive the summer. Even if the water is warm but Well oxygenated they can survive as long as you leave them alone in the warm water. But you never know - I've seen trout survive some how in some real mud holes.
