How far did you go back in that creek arm? I would have went way back in myself to start. If you were catching them out over deep water I would have tried those depths and shallower near the end of the creek arm. Ledges or quick drops with some kind of cover would be a good place to start. Water might have been a tad warmer also. If you don't know the area very well you fished it's that much harder to figure them out. Sometimes they are where you least expect them to be. Guess that's why it's called fishing instead of catching. I'll be fishing the end of creeks before long here. It needs to warm up some and with some warm rain added in. I ain't no expert but that's what I would have tried.
Larry