I second glance many of those beaches haven't been tested since before the flood.  I was at the picnic area at  Gooseberry S.P. yesterday and there is no way I would have waded in that water.  I have never seen Lake Superior so murky and it smelled bad.  My buddy said he heard a no contact advisory from Duluth to Hovland.  I can't find the link but I think a wait-a-while-before-swimming approach is best for now.