Deepest lakes & reservoirs in Ontario, Canada by maximum depth (ft)
The estimated greatest depth of the water in a lake can be measured at the lake’s normal elevation. If the water volume and surface area of a lake are known, an estimate of the lake’s average depth can be calculated:Water volume ÷ Surface Area = Average Depth
Example: 1,000,000 acre-feet ÷ 20,000 acres = 50 feet average depth.
You can find many of the the world’s deepest lakes on LakeLubbers. If you sort the list, you will find the (maximum depth of) the shallowest lakes in our database. Note: For some lakes, lake depth data is unknown, so this table may display fewer lakes than the total 55 articles we have published for Ontario, Canada lakes.
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Below are lakes within Canada > Ontario, Canada > Compared by maximum depth in feet. This list does not represent all lakes in Ontario, Canada, only the 55 Ontario, Canada lake articles we have published on the LakeLubbers website.
Lake name  |
Max depth in feet |
Lake description |
|---|---|---|
| Upper Rideau Lake (Canada, Ontario, Canada) |
72 ft | Also known as Rideau Lakes Upper Rideau Lake holds a prominent place in Ontario’s ‘other Cottage Country’. Although many think of the area around Lake Muskoka as Eastern Canada’ … |
| Little Lake (Canada, Ontario, Canada) |
60 ft | When Thoreau wrote about Walden Pond, he obviously didn’t know about Little Lake. For this small lake in Ontario’s Rideau Lakes area could certainly i … |
| Lake Abitibi (Canada, Ontario, Canada, Quebec, Canada) |
49 ft | Nearly 250,000 acres of water delight visitors to Lake Abitibi on the Ontario/Quebec border. This huge lake is actually two lake basins connected by a … |
| Sand Lake ON (Canada, Ontario, Canada) |
47 ft | Also known as Davis Lake, Rideau Lakes Sand Lake is one of the best-known lakes along the Rideau Waterway in Eastern Ontario. Sand Lake is the location of idyllic Birch Island and home to m … |
| Buckhorn Lake, ON (Canada, Ontario, Canada) |
47 ft | Also known as Trent-Severn Waterway, Kawartha Lakes Part of the Kawartha Chain of Lakes, Buckhorn Lake is one of the many lakes that make up the famed Trent-Severn Waterway. The waterway connects Lake O … |
| Benson Lake (Canada, Ontario, Canada) |
40 ft | Also known as Rideau Lakes Benson Lake is part of the historic Rideau Waterway in Ontario, Canada. Benson Lake is one of six lakes surrounding Scott’s Island. Benson Lake, Clear … |
| Lake Couchiching (Canada, Ontario, Canada) |
39 ft | Lucky cottagers at Lake Couchiching have the best of all worlds. As a part of the famed Trent-Severn Waterway, Lake Couchiching is the perfect home ba … |
| Lake Opinicon (Canada, Ontario, Canada) |
35 ft | Also known as Rideau Lakes Opinicon Lake is part of a chain of lakes known as the Rideau Waterway in Ontario, Canada. The lake is connected to others by a canal system called th … |
| Bass Lake, ON (Canada, Ontario, Canada) |
32 ft | Nestled in the heart of Ontario’s lake country, Bass Lake is a popular 1,000-acre recreational lake just west of the town of Orillia. Only 60 miles fr … |
| Blue Hawk Lake (Canada, Ontario, Canada) |
30 ft | Surrounded by beautiful scenery, Blue Hawk Lake is located in the Haliburton Highlands region in Ontario, Canada. The Haliburton Highlands region was … |
| Lake Saint Clair, MI / Canada (Canada, Michigan, Ontario, Canada, Southeast Michigan, US Midwest Region, USA) |
27 ft | Also known as Lake St. Clair Heart-shaped Lake Saint Clair is the smallest body of water in the Great Lakes system. Tucked between Lake Huron to the north and Lake Erie to the sou … |
| Rice Lake (Canada, Ontario, Canada) |
26 ft | Rice Lake is a 24,748-acre lake located in south-eastern Ontario, southeast of the city of Peterborough and north of Cobourg. The beautiful lake is pa … |