Deepest reservoirs in Canada

As of 2026-10-16, Manicouagan Reservoir tops the list with 350 m.

1. #1 Manicouagan Reservoir — 350 m

   lake in Quebec, Canada

   source Wikidata
2. #2 Williston Lake — 166 m

   large reservoir in British Columbia, Canada

   source Wikidata
3. #3 Ross Lake — 165 m

   reservoir in Washington state, United States of America and British Columbia, Canada

   source Wikidata
4. #4 Lac Sakami — 113 m

   reservoir in Quebec, Canada

   source Wikidata
5. #5 Lake Tremblant — 91 m

   lake in Lac-Tremblant-Nord, Quebec, Canada

   source Wikidata
6. #6 Lake Diefenbaker — 66 m

   reservoir in Saskatchewan, Canada

   source Wikidata
7. #7 Spray Lakes Reservoir — 65 m

   reservoir in Alberta, Canada

   source Wikidata
8. #8 Lac au Sorcier — 53 m

   lake in Saint-Alexis-des-Monts, Mauricie, Canada

   source Wikidata
9. #9 Caniapiscau Reservoir — 50 m

   large reservoir in Quebec, Canada

   The Caniapiscau Reservoir is a reservoir on the upper Caniapiscau River in the Côte-Nord administrative region of the Canadian province of Quebec. It is the largest body of water in Quebec and the second largest reservoir in Canada. Read more on Wikipedia.

   Wikidata
10. #10 Lac Seul — 47 m

    reservoir in Kenora District, Ontario, Canada

    source Wikidata