I was thinking of trying Boggy Lake out for flat water/speed runs, so I did some researching of potential hazards, read through various posts, looked at the hazards map and also at old satelite photos.
In the process I found something that looks like a fence on the satelite photo from 2009 that may now be under water and it doesn't appear on the hazards map - and it's on the other side of the lake:
(if you look closely, you can spot shadows of at least 11 fence posts all in straight line between the 2 red arrows, plus 2 more out of line with the rest just under the top red arrow)