Correct. However, as the size of capital ships outgrew the capacity in Charlestown, the Navy made extensive use of the facility. An anchor from a warship (U.S.S Kearsage?) used to sit by the guard post.
There have been a variety of efforts to maintain a nautical use for the property. About 16 years ago, I represented one of the principals in the National Transportation Safety Board investigation of the grounding of the Queen Elizabeth 2 off Cape Cod. She was heavily damaged (for comparison, many multiples of the damage that sank the RMS Titanic). The QE 2 was brought into the park drydock for repairs.
It was a bit of an embarassment. The granite dry dock is gigantic, a real work of art, perhaps 150 years old. But it was neglected. There were small trees growing out of the basin and stonework that had to be cleared. I vividly recall having to walk down 7 stories of wet, worn granite steps, reaching for an iron railing that had rusted away 40 years earlier.
As you would expect, there were safety precautions. All 70,000 tons and 963 feet of QE 2 were put up on old blocks, so as we headed down to the basin to inspect her bottom, we were given hard hats to protect us should the ship fall on us. It was amazing to stand under the bow, touch the keel 2 feet above your head, and look back toward the screws at the other end of this thousand foot long ceiling. The bottom of the dock was slightly awash, populated with dead fish wearing quizzical looks.
The guys at the yard really hustled, because they wanted to bid on the repairs. The work would have been the making of the yard. But the facilities let them down. I believe Bremerhaven got the work, $50 to $100 million in repairs. (Cunard has always been very coy about what was really done. Having seen the damage with my own eyes, and having done so in the company of a marine surveyor, it was clear the ship would have sunk if it were further from a port.) The Boston boys did a nice patch job, the QE 2 was withdrawn for service, and set sail for a lenthy layover in Germany.
Sorry to ramble on, but I guess my point was that this was the sort of use the city and state hoped to encourage. Perhaps that is why it has not yet been turned into a yacht basin.
Toby