The outermost island is Lucille, and like Susie and Francis islands, it was named for a member of the Falconer family who once lived on Susie, mining its copper ore during the early 1900s.

The Nature Conservancy and the Grand Portage Band of the Chippewa Tribe are working cooperatively to ensure that the area will remain intact and that the unique and unusual flora of the islands will survive.

[1] Susie Island was previously owned by the Nature Conservancy and held as the Francis Lee Jaques Memorial Preserve[2] and is the home to some of Minnesota's rarest plants, including alpine bistort and slender hairgrass, both species of special concern, mountain or rock cranberry and common bearberry.

In 2017, the Nature Conservancy returned the island to the Grand Portage Band of the Chippewa Tribe.

The interior of Susie Island is carpeted with a thick layer of moss.