My biggest secret that I will always share openly.(And this holds true more often than not!).Is simply to avoid bridge holes or most any water within 200 yds of any type of roadway....and you will double your chances...!
Bill, another gentleman, also named Bill, from the Auburn Fly Fishing club just gave me the same advice. He said "If you hike 1/10th of a mile you'll avoid 9/10ths of the fishermen". I've certainly found that to be true.