Thunder Bay District lake depth maps

Explore 288 lakes and rivers as 3D depth maps, built from Ontario MNRF bathymetric surveys — surveyed depth draped over real elevation and aerial imagery.

Featured depth maps

Largest in Thunder Bay DistrictOgoki Reservoir72 m (236 ft) deep · 54,848 acresExplore the 3D map →Deepest mapped contourLong Lake167.6 m (550 ft) deep · 34,095 acresExplore the 3D map →Second largestDog Lake100 m (328 ft) deep · 37,793 acresExplore the 3D map →

Where the lakes are

Dot size and shade follow max depth: under 15 ft 100 ft and deeper

Group of nearby lakesRiver reach

All 288 mapped waters in Thunder Bay District; deepest is Long Lake at 550 ft. Tap a numbered circle to zoom in, then a dot to open a lake.