[1] Smooth Island forms the southwestern side of the Minnicog Channel.
[4] Since 2012, Smooth Island has had a small bay with a sandy bottom.
[2] A bay on the island has dense populations of bulrushes, grasses, bushes, and reeds, which are able to grow there due to the low water levels.
[5] There are a number of small rocks on the southeastern side of the island.
Additionally, dry rocks extend almost 0.6 miles (0.97 km) beyond its northwestern edge.