Wow GermanPA, sounds like you got a big project ahead of you. As I was reading your very descriptive and thought out post, I kept saying to myself that photos are going to be helpfull for everyone to get a view of your situation. Then at the bottom I see your comment of photos.

Link to posting photos; link

Look at Bill Cody last post at that link. Simple and easy, at least it was for me. You need a photobucket account, but that is easy too.

As far as the rest, the pros are going to have to help you out. The price seems high, but it could be your obstacles around the pond. That is where photos are nice. Seems like for all that work, the whole dam might be reworked because of all the trees. You might fix this one problem, and a few years down the road a dying tree will force you thru another session of the same..... Lets wait and see what others say, and work on those photos. Welcome to pondboss.