In April 1865, an immense ice jam between Trois-Rivières and Québec raised water levels by more than five metres. The archipelago was almost completely submerged; nothing but water could be seen. This disastrous flood resulted in about 30 deaths, including 19 on Île de Grâce. Fifteen of the eighteen homes on the island were destroyed. A few years later, almost all of the homes on this island had been rebuilt.

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