I just got back from a very productive 5 days in Aroostook and Washington Counties in Maine. It was a very long drive (at least for the East Coast) - I accumulated over 1200 miles of driving in 5 days.
After bagging Peaked Mtn up in Aroostook, and then some stations and monuments along the North Line of the US-Canada boundary, I drove down to Calais on Monday afternoon. I was to be in Calais for 2 nights for the dedication of Meridian Park, at the site of the old Calais Observatory. While in Calais, I recovered 4 pairs of stations in my spare time - 1909 triangulation stations paired with 1921 IBC Reference Monuments.
[b]So what are these double survey marker stations?[/b]. All along the shore of the Saint Croix River, from it's mouth down in Robbinston up along the river into Aroostook County, the International Boundary Commission and it's Predecesssor the US and Canada Boundary Survey was tasked by the treaty of 1908 to define all the points in the Saint Croix river which constituted the boundary. This consisted of almost 1100 turning points - points in the river wherever the river made a turn - all the way from it's source in Amity in Aroostook County where the stream was but a trickle, down to it's mouth in Robbinston where it empties into Passamaquoddy Bay where it forms a broad stream between Maine and New Brunswick (and has 20+ foot tides). But none of these points is marked. They are out in the river, so they exist only on paper. They are virtual boundary points if you will. But in order to specify exactly where these points were, the shore line was carefully surveyed and hundreds of triangulation stations were put into place starting in 1909. These were usually disks, or sometimes drill holes in rocks. They used USC&GS old style tri-station disks (which had just come into use), since they did not have any disks of their own making till 4 or 5 years later, in the mid 1910s. Somewhat later (around 1912 or 1913) they produced a custom reference marker for this purpose - an 8 inch long bronze post suitably marked. There were a total of 245 of these put in along the US and Canadian shore lines of the St. Croix, starting with No. 2 near the source of the St. Croix to No. 246 down in Robbinston.
To save the cost of resurveying the whole river, they set these bronze posts right next to the 1909 tri-stations. Occasionally, when the older disk had broken off, they would simply put the newer marker right where the old disk had been. The first of these were set in 1913 near the source and In this area of the river the posts were put in place in 1921.
This is a nice pair of marks with the disk marking triangulation station "DE MONTS" (named for the leader of the 1605 French settlement on nearby St. Croix Island?) and the Reference Mark (No. 239) standing behind it. The marks are located on the public beach in the Devils Head Conservation area about 5 miles south of Calais.
[Photos:]QF0712 DE MONTS, Calais Maine
QF0712 DE MONTS, Calais Maine
QF0712 DE MONTS, Calais Maine