Olfishead, there is none that I know of surviving high water episodes. Wish there was. When the water stays normal for a few years, you can see floating around in the lake hints of what looks like millfoil. I have no idea where it comes from🤷 Must be little sparse patches somewhere. But the lake gets high again and you don’t see for several years again. Not sure how many years ago( I loose track) but way up the Lindley almost to sleepy hollow there was 2 little patches of milfoil, now it’s gone😭