The center portion of the fort, between the two roadways, was the actual parade ground. Much of this area (and the area marked as the site of Anti-Aircraft Battery No. 3) has today been redeveloped into a children's camp for the City of Boston, and a fence has been erected at the northeast end of the old parade ground, to keep visitors out of the old concrete structures nearby. The Mining Wharf has been redeveloped into a modern pier for boats coming from Boston.

The red labels were added to this map for Wikipedia to highlight and better identify the structures associated with the storage and preparation of submarine mines, which continued at the fort into WW2, after the command and firing functions for the southern sector mines of the harbor defense were moved to nearby Fort Warren on Georges Island.