This map of Balsam Lake in the Kawartha Lakes region is from a series of bathymetric maps produced by the Ontario Ministry of Natural Resources. It is from the 1960's and is an excellent example of depth chart maps from this period.
Balsam Lake is the highest point of the Trent–Severn Waterway and from here, the waterway descends to Georgian Bay in the northwest, and to Lake Ontario in the southeast. It is the highest point to which a vessel can be navigated from sea level in the Great Lakes-Saint Lawrence River drainage basin.
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