EBBS,
Small world, I live in Cottage Grove too.
Red Wing is usually where I go a few times a year. Just south of Red Wing is a power plant that keeps the water open and a park there that I go to.
It is well known to eagle watchers. Collville Park.(or something like that)
I usually make my decision to go or not based weather forcasted for a week-end. Tenativly The first week-end in March is good.