Most people put in just above the lip of this drop in a small eddy on river left.  If the eddy and rock forming it are gone, the flow is high.  From the eddy you can two or three strokes before dropping over the lip.  It can be run almost anywhere, but I have seen people swim here before.  I usually boof it hard, but some people complain of landing in the green water and having a sore back.  Staying more center and left seems to offer more aeration.