PonderingThings said:Richard thank you for your interesting post... I learnt a little more about tracking dogs today!
I also really like Becba's theory. I can envision this happening. What if Anna was with someone who was taking her, and that person backtracked, with Anna for some reason? (Possible.)
Anna's Mom was the creek navigatable by boat or canoe? It sounds like it was running fast, deep, and had obstructions in it. Could an experienced person with a canoe, or small inflatable boat have made it down the creek? (The creek was normally very small and was not navigatable by boat or canoe. It ran several miles toward the Pacific ocean and had many obstructions, all of which were removed one by one by searching divers in the days following Anna's disappearance.)
I'm thinking of one of the transients. Since you live(d) in an area where there are many, and its rural, perhaps someone was "hiding out" in the woods? The original track was to their "camp site" and the backtrack was to where they had some kind of boat? (A boat would have been useless.)
The backtrack area... was it where someone could have set up a camp site that would have been unseen by you and your neighbors? ( Quite easily.)
Not knowing the terrain its hard for me to determine how wild an idea this is!
Good questions. Thank you.