I wouldn't target tailout water that shallow, but I have caught at least 50 fish in 1-2' of water in seams, cutbanks, and the edge of strainers... summers will also hold in 1' of water in a run or pocket water. Your best bet is the middle to the tailout of slower water with drift gear, but with hardware or flies I would cover any water that offers any protection, this includes shallow runs with heavy tree or brush cover. All rivers fish and hold fish differently, if you fish eagle or big creek, or the kilchis, miami, salmonberry... like you fish the clack or sandy... you will miss half the opportunitys for fish.