Ontario Lake Depth Maps: Lakes G–J

Ontario’s provincial bathymetry covers thousands of inland lakes, most of them in cottage country and the north. Depths come from survey contours that TopoStack interpolates within the surveyed area.

Each lake name below opens the studio framed to that lake’s survey area and generates its terrain. You can also search every surveyed lake or browse other regions.

Largest survey areas

Hawley Lakes
Gull Lake 51.302° N, 91.950° W
Goshawk Lake

Lakes with surveyed depth data

Make a lake map from this data

Open a lake from the list. The studio frames its survey area, turns on Water depth and generates the terrain. Widen the frame and regenerate if you want more shoreline.
Check the warnings above the preview. The studio warns when survey coverage is partial or depths are estimated; how lake depths work explains why.
Enter your sheet thickness in Terrain layers; the studio works out the layer count. If a deep lake needs more sheets than you want, Fit depth compresses it while keeping the shoreline. The custom lake map guide walks through the whole build.
Turn on paint templates to spray only the water on each layer, and split the map if it is bigger than your laser bed.
Export the SVG layers. The download’s ATTRIBUTION.txt credits the survey used.

Data source

Ontario lake bathymetry: survey contours. Contains information licensed under the Open Government Licence – Ontario. Survey contours interpolated by TopoStack; not for navigation.

Survey dates and water levels vary between lakes, and a listing can cover only part of a lake. See sources and attribution for credits.