I waded the BS dam early Easter morning; the first time I've had the opportunity to do so since the area re-opened on Feb.1. The didy is there in mass. Thick and soft, wavy white tips,very comfortable to walk on. Certainly not an expert on this subject, I think that this is the condition it takes on when first appearing. I live at the tip of Cane Island, about a mile and a half below the dam. The didy here has changed over the winter from soft and comfortable to a thin, tightly woven, "pool table top-like", slick as snot, covering. Again, not being a biologist, I would tend to think that it doesn't start from an organism brought in on the bottom of a boat or boot. The fact that "fresh didy" seems to start right at the foot of the dam suggests to me that its already in the water as it is released through the gates. Does it cover the bottom of BS lake, I've never heard anyone mention its presence. Maybe the lakes too deep and it can only thrive in shallower stretches,i.e., the river. Hopefully, the biological studies that are underway are taking this point into consideration.
Patricks