I am speaking from a WI resident’s perspective… The reason I believe you can fish from the Sconnie side with a MN license and three lines is as follows: I fish at Somerset Landing in MN on the St Croix every once in a while, so I called the WI DNR just to make sure I was doing everything ok.
They told me that you need to follow the laws for the state in which your fishing (and I don’t know if they were implying the license you carry, but if that’s what they meant, they should have said it.)
And yeah, unless I’m wrong, we’re allowed 3 lines in WI.
-Mike