We have a winner ! Good job Bob.
Now you have piqued my interest to investigate the location of your guess in post 881. It will be interesting to see if there are similar construction techniques or to see if there is anything there at all. I will try to get there this week.
Would loved to have walked that road in 1930.That road appears to be a main route from the south side of the Rider Bogs to Parkdale. I bet cranberry vehicles went across there and it had to be sturdy.
Not sure