Historic Bathymetry Maps Historic Bathymetry Maps

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Between 1948 and 1995 the Ontario Ministry of Natural Resources and Forestry (OMNRF) captured bathymetry data for over 11,000 lakes across Ontario. The historic bathymetry maps were created using simple methods to determine lake depths and were meant for resource management purposes only. Very little effort was made to identify shoals and other hazards when creating these bathymetric maps. Since the data was collected a number of both constructed and naturally occurring events may have resulted in the depth information becoming inaccurate. For this reason the historic bathymetric maps should not be used for navigational purposes. In many cases, these maps still represent the only authoritative source of bathymetry data for lakes in Ontario. These maps are being converted to digital GIS line data which can be found in the Bathymetry Line data class. The Bathymetry Index data class identifies if GIS vector lines have been created. The majority of the historic paper maps have been scanned to digital files. Digital files will be added to this dataset when they become available.