The Humbug Marsh Unit represents the last mile of natural shoreline on the U.S. side of the Detroit River. This 410‐acre parcel of land spans into both Gibraltar and Trenton, Michigan and contains Humbug Island, Humbug Marsh, the shallow waters in between, and the adjacent uplands. A diversity of habitats is present within the unit, including old growth oak‐hickory forest, vernal wetlands, second‐growth forests, and coastal marsh. Because the vast majority of shoreline along the Detroit River has been disturbed or destroyed (i.e. 97%), Humbug Marsh is significant as a stopover location for many migratory birds, as well as significant for many local populations of wildlife. Specifically, it has national significance for the bass, walleye, and whitefish populations that thrive here, the diving ducks that live on its shoreline and in its waters and the 17 species of raptors that stop here along their migration route.
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