Well, the graphic in each was way off. So, we will update this today and will follow up with an in-depth look at this particular concern of ours in terms of how the realization came about of what happened over the years plus start a look at Thomas' timeline.
What led to this review was seeing the plate in Dr. Frank's book (1907). He mentioned Gardner's bridge being visible. And, it turns out that the plate was in the area of Main and Central in Peabody. Fortunately, there had been two paintings (1826/28 and 1848) of the area that helped fill in some notion of dimension.
At the moment, I'm perusing Sidney's antiquarian periodical for all maps and text that will be pertinent to writing the proper story.
Remarks: Modified: 06/02/2019
05/16/2019 -- Lots going on that can get in the way, but we persist. The first of many posts: Massey's Cove. This came about by seeing Henry Lunt mentioned on one of Sidney's maps in an area downstream along North River.
06/02/2019 - Profile of Sidney on WikiTree.