Our smallest pond is roughly 1/8 acre and 4 feet deep at the deepest point. Last summer we took a back hoe to it and cleaned out the debris and sediment from the bottom. The pond has been brownish color from the suspended clay for months and now this spring nearly 3/4 of the pond is covered with parrot weed. This week I noticed that the water has turned virtually black. What could be causing this?

"Our Life is frittered away by detail. Simplify, Simplify" -Henry David Thoreau -