Depends on where you plan on fishing. On Anchor Bay, there are a few points (penninsulas) jutting out to give you some protection from the wind. If the prediction is for 10-20 MPH winds, that means wind gusts up to 30 MPR most likely. Would be choppy out in the middle of the lake. If you fish in the marsh areas, (Big or little Muscamoot Bay, Fisher Bay, Goose Bay, etc.) you would also be protected. As far as the St. Clair River goes, I am not a river fisheman, but maybe someone will chime in here that will know the answer, but I doubt it. This site is pretty much dead now.