 The island hosts a unique floodplain hardwood forest – among the most rare plant community types globally.The Allegheny County Natural Heritage Inventory included Sycamore Island as part of the “Allegheny River Biological Diversity Area” which has a ranking of High Significance.On December 28, 2007, Allegheny Land Trust acquired the Sycamore Island with Colcom Foundation providing full funding for its conservation.