milo, i meant that if in 6' of water, I'd present jig at 3.5'. things change according to conditions, ie, colored water; obviously would try to put jig closer to bottom as the lack of vis will deter a fish sitting on the bottom from seeing jig...clear water with high vis, not important at all to be near the bottom...fish will easily see and attack a properly presented jig 3 ' and more above them. plus if your jig is 5' from your float in 6' of water, snagging on bottom debris is likely. if you feel there is no danger of snagging, lengthen leader. imo unless conditions require it, being on the bottom foot of water column with a jig is unnecessary, perhaps counter productive as fish holding in any other areas of the river will not be able to see the jig at all. for example, a fish 10 feet away for example from your drift's track will easily see a jig that is higher in the column.