Since you were going up river from the harbor, a couple of mile up river, I am guessing you were just below the 79 bridge on the left bank, correct? There is some nice fishing in that little back water there, but there is also an unmarked dike (or something) at that bak water. I used to live in PB a few years ago, and hit it 2 times untill I decided NOT to fish it unless I was in the canoe and just launched from the road. I also know of a couple guys that did the same thing, without the trolling motor issues.