Visited Silver Lake and Park... Silver Lake is a small lake near Coboconk, in the Canadian province of Ontario. It is the lowest lake on the Gull River watershed, supplying water to Balsam Lake at the top of the Trent-Severn Waterway. Like many other lakes in the Kawarthas, Silver Lake lies in a depression formed between the Precambriangranite to the north, and the Ordovicianlimestone to the south.