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Geospatial line data from the Government of Ontario representing natural and manmade hydrographic features that can impede waterflow or navigation. The dataset includes features such as break walls, dams, waterfalls, lock-gates, rapids, rocks, Sea Lamprey barriers, and shipwrecks. It was last updated in March 2026 and requires GIS software for use.
Released under the Open Government Licence - Canada (OGL-CA-2.0). Requires Geographic Information System (GIS) software to use the data. Available in ESRI REST and other formats including ZIP, PDF, and DOCX.