Sounds like Mill Lake is a bit of a hotbed for invasives. I wonder if this lake might be a candidate for an intentional fish kill. Not that I would be in favor of that necessarily, considering other ecological issues, but sometimes it might be worth losing a battle to win the war. Nobody knows what the true cost is of a successful invasive species. Are there any tribs or connections to larger waterbodies from Mill Lake? Either way, if there are as many invasives as people have suggested here, something should be done about it.