Bill,

You are probably right about the cow poop. While I haven't seen any pies in the creek, there is run-off from the field where they graze. Short of denying the cows access to this field (I am considering converting it to a hayfield), is there anything I can do to counteract their effect?

I will measure the muck depth on my next visit. Assuming it is 12 to 18 inches, is there anything I can or should do about it?

I have observed the green water and pondweed both last year and this year. I don't know about previous years. Last year, my neighbors complained about the green-ness of their ponds, so it is possible that this is a recent condition.

If an picture of the pond would be helpful, I can provide one.

Thanks