Ile Ste-Rosalie, also known as Ile Rosalie or Crab Island, is a small island situated on the Ontario side of Ottawa River offshore from Fairmont Le Château Montebello.

In 1912, Thomas Weir oversaw the erection of a wooden tower and the installation of a sixth-order dioptric illuminating apparatus in its lantern room to mark the island. The cost of the lighthouse was $1289.73. Alphonse Rosalie was appointed the first keeper of the lighthouse on October 29, 1912 at an annual salary of roughly $220, and he served as keeper until his death in 1936.

After vandals destroyed the island’s wooden lighthouse in 1978, a skeletal tower was used to exhibit a light from the island until 1999, when a buoy was placed nearby. In 2021, Île Ste-Rosalie light buoy H311 was anchored just north of the island and exhibited a flashing green light every four seconds.

Keepers: Alphonse Seguin (1912 – 1936), Colin Campbell (1938 – 1966).

References

1. Annual Report of the Department of Marine, various years.

A lighted buoy marks Ile Ste-Rosalie today.

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