The effects of the warmer lake water is reduced when the lake freezes over. In January 2011, for example, residents of Cleveland were glad when Lake Erie was "90 percent frozen" since it meant that the area had "made it over the hump" in terms of enduring repeated snowfalls which required much shoveling. Being the shallowest of the Great Lakes, it is the most likely to freeze and frequently does. In contrast, Lake Michigan has never completely frozen over since the warmer and deeper portion is in the south, although it came close to being totally frozen during three harsh winters over the past century. In past years, lake ice was so thick that it was possible to drive over it or go sailing on iceboats. Many lake residents take advantage of the ice and travel; some drive to Canada and back: