That ship is aground outside the West entrance into Noank - not really in the Mystic river. They were squeaking it past there during low tide. Not exactly shallow - there should have been 13-14' of depth
there at low tide. Problem for everyone else is that that entrance into Noank is narrow and blocked for everyone else. There is another entrance, but you have to go out and around some shoals to get to it.
Don't know where it was going after that - it does get shallow further up river. One or two large ships a year go aground in this area trying to get up to Mystic Seaport.
Grounding in the river is no problem - mud. Grounding where this ship did is a lot of granite...