Avoid dead water
A “pool” is an area where fast flowing water enters a deeper pool of water. Often found just after riffles, a pool offers little in the way of prospecting in the interior. It does, however, offer excellent prospects in the areas where water flows in. More than a few species of fish feed at such locations as the water flowing into the pool brings food and nutrients with it. “Dead water” refers to an area where there is little or no current. This tends to occur in odd geographic areas, large rivers or areas with flow problems. Dead water is rarely a good place to fly fishing, so avoid it like the plague.