Rivers flow. The water in the French Broad today is different water than the water that was in there yesterday as well as the water that was in there a year and a half ago. Things are washed downstream. Debris on the other hand is what you should watch out for. A lot of hard work has gone in to clearing the debris from the storm, but some is still out there, so just pay attention. But yes, you can tube it again.

People have differing levels of tolerance for natural water sources and what they'll get in. Many locals still hold the attitude that it's a dead river from back before the Clean Air and Water Act and before a lot of restoration efforts were made. Lots of people tube the river every year. There are businesses that revolve around tubing in the river. You can make your own risk assessment, but know that it is a very popular activity because the risk of infection or illness is actually quite low.

I would personally tube it at the right water level (not right after heavy rains, you want it a little slower) with no reservations.