I would exercise extreme caution if you were to try any harbors in the sw area. Ice fishing Lake Michigan is not a safe option. I have heard of a few guys ice fishing the Michigan City harbor for steelhead in years past but that is only after extended periods of cold weather. The harbors can open up pretty quickly with run off, snow melt, current or a warm up. Even a shift in wind can shift the ice. I've never heard of guys catching perch in the harbors through the ice. I have always wanted to try it for steelhead but it's just not worth the risk for me. I can wait a month and slay them in open water.