Merdav,
Since we have stepped in to radical idea land, here is a thought.
It looks like you place is fairly large and is very green. Would it be possible to irrigate your property with the pond? Might take all summer to bring it to a level that can be dredged but, if your area is large enough it might work, plus you would be putting all of the nutrient to work around your place. An inch of water on one acre is about 27,000 gallons.
I know it is a difficult decision to make to drain, I have done partials twice and both times hated it.
