If you are wondering about the big picture, here’s a plot of ice coverage over the eastern Great Lakes as of January 15, 2014. I found it yesterday after posting the photo from Belvedere Hill. Click on the image and you will be able to see the legend which makes things pretty clear. Here’s the link to the site from where the map was taken. (The map you see below is #5 on the list if you follow the link.)
When you click on the image below you can see the Big Sound is in what’s considered ‘Medium Lake Ice’, which thins out until you hit the larger part of Georgian Bay. Lake Erie appears to be ‘blessed’ with even more substantial ice coverage than Georgian Bay. (JB – Communications Officer).