Usually clear is referring to depth visibility. And it's all relative to normal water conditions. All lakes get "clear" and "dirty". Average visibility of 6 inches means 12 inches of visibility is clear and 1 inch is dirty. Average visibility of 5 feet means 10 feet is clear and 2 feet is dirty.
Commented on When we’re talking about clear water,...
30 Apr 13:34
Some bodies of water are clear all the time which I would imagine is 20+ feet of visibility all the time. Im surprised when I can see more than 6 inches Into the water.