On the hard freeze years, that area will have safe ice. On years like last and how this year is starting, you'll have to check daily and tread carefully. Quad ciites seems to be the cutoff for good ice on warm years, with clinton and north being even better. It's really amazing what an hour drive does to the ice. Start at clinton on thick hard ice and go an hour south to the QC and its iffy, then go an hour south to muscatine and its open water or unsafe. Pretty crazy. My advice is if you are not experienced with the backwater south of the QC, don't go alone and be very careful. The water fluctuations always have an impact on ice, but down there it seems to really shake things up.