Rob J - "dragging anchor" in a driftboat usually means you drop it before stoppng the boat with the oars, so momentum carries you forward a ways, or the flow is high and the type and size of anchor on board is not sufficient enough to stop the boat. In case #1, it's an easy fix - just pull on the sticks a few times before letting the anchor rip. In case #2, it is sometimes unavoidable and it happens to all driftboaters from time to time, but you can limit this by either pulling over towards the bank out of the current (which is where you should probably be fishing anyways when the flows are high) or simply stay on the oars and forget about the anchor. Other options are getting an "animal style" anchor - I have heard they sometimes stick better. Bottom line - dragging anchor should be avoided as much as possible, as it is bad for the river ecology. Hope that helps.
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"Eventually, all things merge into one, and a river runs through it."