Accompaning note states, "Floating Drydock - To augment Drydock No. 1 and Drydock No. 2 Charleston maintains ARD 15 shown here, and ARD 12. These ARDs provide additional capability for meeting heavy docking needs to Fleet in this area."
Under tab "Building Ways". Printing on the bottom states, "200-40 US Navy Yard, Charleston, SC. 1 March 1940. 15-ton Cranes for New Shipways No. 343. Allotments 7x222-24-1 and 7-08/0679.1-87-4 Contract NOy-3447. View looking north. File 8056."