You are aware there should be no trees on the dam? If I were to plant a willow on a 1 ac pond it would have to be at the farthest point from the dam as the roots can grow 100 ft or more.
Yes willows drink alot of water. Here's a link I found searching for willow tree : http://www.pondboss.com/ubb/ultimatebb.php?ubb=get_topic;f=14;t=000015


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If you can read this ... thank a teacher. Since it's in english ... thank our military!
Ric