I got out in the kayak at half drained level and used my paddle on the water's edge. The stuff stirs up like mud soup pretty easily! I think I will use a trash pump at the dam side periodically as I lower the water level. Lots of exposed tree stumps now as well as the shape of a small creek that the springs fed before creating the pond. I'd say the median is 1.5 ft of sediment with several areas being 4-5 ft.