I stumbled on this really fascinating article about quarrying on the Potomac River, something that I had never heard of. I knew that Smoot Sand & Gravel, a major customer for the B&O’s Georgetown Branch, did dredging in the Potomac River for sand and gravel, but I did not know they did quarrying, and to such a large scale! Apparently there were many, many quarries located on the Potomac shores which were all abandoned some time in the late 1930s/early 1940s. This article outlines some of those details and shows the location of one such quarry with equipment still left behind. Amazing. I will have to go!