As I reported several months ago, there is a wood grain elevator in Cleveland, Ohio, that is said to date from the Civil War. If this is true, this elevator might well be the oldest of its kind still standing in North America.
From a distance, I have learned that the area in which this elevator is located (1635 Merwin Avenue) used to be the northern terminus of the Ohio & Erie Canal, which was in use between 1829 and 1872. There used to be a canal basin across from the elevator, which is located on the banks of the Cayahoga River. It seems that the site was once occupied by the Cleveland Steam Mill (a steam-powered flour mill) and the Cleveland Linseed Oil Works.
Unfortunately, the current owners of the structure haven't been very helpful. I called the plant manager of Cereal Food Processors (the current owner of the property) and was referred to the company headquarters in Kansas City. To date, several calls to the latter have gone unanswered.