DEEP has confirmed that there is a houseboat type craft heading to Groton. The dock is already in place, so there is nothing that DEEP can do to stop it. The only limitation of the size of a boat is the dock itself. Currently, there is nothing to stop this from happening on MI. 

The situation at 28 Schoolhouse is a great example. A parcel that is surrounded by wetlands, too small for a house can be used for a huge dock, sized to potentially berth a 50' houseboat and a 40' Sport Fisherman. The current laws only regulate the dock size. Dock applicants are not required to even describe the type or size of boat they are planning. If approved, a houseboat can be parked in the cove in front of 28 Schoolhouse Rd.  Of course it would destroy the views for current property owners and for everyone who drives by. DEEP has clearly stated that they are powerless to stop this. Once started, this type of development will be difficult to stop. The project at 28 Schoolhouse may seem remote, but it can set precedent that can effect everybody. Here is an example.

The Allyn's Alley dock parcel, the parcel that abuts it, and 2 Allyn's Alley are owned by the Masons Island Company represent almost three acres of property that is zoned RA-20, which is residential, not wetlands. The existing dock has enough dock length for 6 very large houseboats. My understanding is that RA-20 land has a 1/3 acre minimum, so the property could be divided into multiple parcels. Stonington Zoning and Planning have stated that the use of small parcels, unacceptable for houses, can be used for docks (personal communication Stonington P&Z).  This opens the door for houseboats, camps, offices etc. to be berthed at this location. See the scale drawing below. Prime waterfront property ideal for people who want waterfront and a place to entertain. Note that Stonington lacks an enforceable sound ordinance (personal communication Stonington P&Z). Also of importance is that DEEP only considers the environmental impact of the dock itself, not its subsequent use. Stonington P&Z considers docks to be beyond their jurisdiction. Once built, the time and $ to try to get them removed becomes a foolish endeavor. This type of development does not enhance Masons Island in any way. It will likely harm property values and certainly diminishes the views and enjoyment of the habitat for all residents.