Okay, maybe free enterprise dictates that you should stake a claim on those "sometimes islands" and then sell the real estate!
Do they ever expect the water to rise to it's former level?
Two weeks ago I had to go to my friends cottage on Lake Muskoka (north of Toronto) to help him tie off his boats. they were in his boathouse, on lifts and just about floating. The level was 2' above the decks and 4' higher than last year. Worst flooding in recent memory. (last flood about 10 years ago only a foot or so ).
I thought that was a lot of water.... but what you are experiencing is missing a lot more water than that!