Log Drift|Coon Bridge in "Lion" (Location)

"Three miles down" (i.e. downstream) from the spot where Old Ben swims across the river is "a log drift" on which some of the hunters cross over on foot to try to join the chase after Old Ben (194). It isn't described, but perhaps a "log drift" is a kind of natural bridge across the river. The most likely such 'bridge' would be a tree that fell on one bank that was tall enough to reach the other side, but in that case why would Faulkner use the word 'drift'? So perhaps a 'log drift' is a collection of fallen tree trunks that the current has carried to a spot where they create a literal 'log jam.' Less likely etymologically, I think, is a rude bridge made of logs - but when Faulkner re-tells the story of Lion and Old Ben in Go Down, Moses, he refers to this location as the "Coon bridge."