Merrymeeting Bay, which has long been Maine's most famous and heavily gunned piece of waterfowl habitat, has had a "no permanent blinds" rule for decades, if not a century. It applies to both floating and land-based blinds, and it is also illegal to leave duck decoys out overnight.
For reason I've never understood, GOOSE decoys can be left overnight. There is one older gentleman who has a pile of goose silouettes out every year. I'm told he sits in his camp and watches them, and if geese light in his decoys he sculls the mile out to them and takes one or two. I've never seen that happen, but there is always a nice sculling boat sitting on his dock. Nobody else seems to take advantage of this "loophole".
Anyway, it is only the lack of permanent blinds that makes gunning in Merrymeeting Bay tolerable. For those of us who are regulars, there are a handful of known productive spots in the parts of the bay we hunt, and I am sure if permanent blinds were allowed, there would be blinds on most of them in short order.
I'm told the regulation came to be when an oufitter on the Bay in the early 20th century put up blinds on some of the best spots to lock them up, then tried to pass a law banning sculling boats. This strategy backfired badly, and the legislature banned permanent blinds on the Bay instead.