jixxxer,
As we all know, trees need lots of water and send their roots in search of it. Pine trees have an unbelievable root system....far more extensive than an oak tree for example. In renovating a pond with pine trees on and around the dam, I discovered the extent to which those roots can invade the dam. Personally, I would not have a pine tree anywhere near the dam. In addition to the root system, pines are evergreen and hence sway and rock with the winter winds, causing further potential damage to compaction in a dam.
If the trees are located well away from the dam, then it is a different story, but in close proximity to the dam, my opinion is that would not be a good choice.
