My friend James Jackson was in Cleveland, Ohio, last week and took a tour of the harbor. It turns out that there is a "Civil War-era" grain elevator located on the Cuyahoga River! (The approximate date "Civil War-era" comes from the taped commentary provided by the boat tour company, which gave no other information about the elevator, which is certainly one of the few 19th century wood elevators still standing, and may well be among the oldest surviving grain elevators in North America.)
As you can see, the entire structure -- even the marine tower -- is made out of wood.
Supported upon huge beams, the marine tower is stationary and built right up against the main house. The word "FLOUR" can be made out on the top of the structure.
From this view of the marine tower, it appears that the iron casing for the elevating leg is intact.
(All photos by Jim Jackson.)