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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Use our free interactive vacation rental map to search and compare multiple vacation properties at a glance. Enter a lake name, a state or city and then simply click on a listing to compare all similar properties, best rates and availability for your dates.Search results: Sort lakes by max depth (feet)
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 |
|---|---|---|
| Lake Superior (Canada, Great Lakes of North America, Lake Superior Northwoods Region, WI, Michigan, Minnesota, Northeast Minnesota, Ontario, Canada, US Midwest Region, USA, Upper Peninsula Region, MI, Wisconsin) |
1,332 ft | Skipping over state and country borders, Lake Superior, the largest, deepest, coldest, cleanest, least developed, and most pristine of the Great Lakes… |
| Lake Michigan-Huron (Canada, Chicagoland Region, IL, Great Lakes of North America, Illinois, Indiana, Lake Michigan Region, WI, Michigan, North Indiana, Northeast Michigan, Northwest Michigan, Ontario, Canada, Southwest Michigan, US Midwest Region, USA, Upper Peninsula Region, MI, West Central Michigan, Wisconsin) |
923 ft | Lake Michigan and Lake Huron – two of North America’s Great Lakes – are contiguous and they share the same elevation of 577 feet above sea level. They… |
| Lake Ontario (Canada, Finger Lakes Region, NY, Great Lakes of North America, Greater Niagara Region, NY, New York, Ontario, Canada, Thousand Islands Region, NY, US Mid-Atlantic Region, USA) |
802 ft | Lake Ontario, one of the world’s five Great Lakes, weaves over state and country borders, delighting Americans, Canadians, and visiting tourists with… |
| Lake Huron (Canada, East Central Michigan, Great Lakes of North America, Michigan, Northeast Michigan, Ontario, Canada, US Midwest Region, USA, Upper Peninsula Region, MI) |
750 ft | A glacial lake of epic proportions, Lake Huron is the second largest of the five Great Lakes by surface area, boasting 23,010 square miles and an incr… |
| Lake Timiskaming (Canada, Ontario, Canada, Quebec, Canada) |
709 ft | Also known as Lake Temiskaming, Lac Temiscamingue Large, scenic and inviting, Lake Timiskaming forms part of the border between Ontario and Quebec. A full 68 miles long, Lake Timiskaming is about 5 mi… |
| Lake Nipigon, ON (Canada, Ontario, Canada) |
540 ft | Located in Ontario Canada’s Sunset Country, Lake Nipigon is a destination into a remote area of pristine wilderness and the largest lake entirely with… |
| Mazinaw Lake (Canada, Ontario, Canada) |
476 ft | Also known as Upper Mazinaw Lake, Lower Mazinaw Lake Amazing Mazinaw Lake holds court as the headwaters of Canada’s Mississippi River in eastern Ontario. This beautiful sprawling lake has alternately del… |
| Big Rideau Lake (Canada, Ontario, Canada) |
328 ft | Also known as Rideau Lakes One of the largest lakes along the route of the Rideau Waterway in Ontario, Canada is Big Rideau Lake. This lake is controlled by a canal system calle… |
| Charleston Lake (Canada, Ontario, Canada) |
300 ft | A natural haven awaits vacationers in Eastern Ontario along the shores of Charleston Lake. Balanced along the eastern edge of the Frontenac Arch geolo… |
| Saganaga Lake, MN / Canada (Canada, Minnesota, Northeast Minnesota, Ontario, Canada, US Midwest Region, USA) |
280 ft | The 13,832 acres of Saganaga Lake straddle the border of Northeastern Minnesota and Ontario, Canada. Part of the well known Boundary Waters Canoe Area… |
| Trout Lake ON (Canada, Ontario, Canada) |
226 ft | Located in Ontario’s Nipissing District, Trout Lake has everything to offer the northwoods adventurer looking for water-based activities. Often oversh… |
| Lake Nipissing, ON (Canada, Ontario, Canada) |
226 ft | Located in the Near North region of Ontario, Lake Nipissing is the fifth largest lake in Ontario excluding the Great Lakes. This relatively shallow 21… |