It is in the municipality of Notre-Dame-de-l'Île-Perrot[1] which intends to preserve its natural state.

[5] Then known as one of the îles Sainte-Geneviève (now Dowker, Madore, and Daoust),[6] the island was granted to governor of Montreal François-Marie Perrot by Jean Talon, in 1672, along with the île Perrot.

[7] It was acquired in 1897[7] by Leslie Rose Dowker (unknown-1945),[8] who shortly afterward became Mayor of Sainte-Anne-du-Bout-de-l'Île, now known as Sainte-Anne-de-Bellevue.

It is the site of a ruined stone house as well as a former navigational aid light.

[9] In older documents,[7] as late as the 1966 topographic map of Sainte-Anne-de-Bellevue, it is named Lynch Island.