Grassy Island
Aerial view of Grassy Island looking north
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 Grassy Island
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| Geography | |
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| Location | Detroit River |
| Coordinates | 42°13′21″N 83°08′05″W / 42.22250°N 83.13472°WCoordinates: 42°13′21″N 83°08′05″W / 42.22250°N 83.13472°W |
| Area | 72 acres (29 ha) |
| Administration | |
| State | Michigan |
| County | Wayne County |
| City | Wyandotte |
| Demographics | |
| Population | Uninhabited |
Grassy Island is a small, uninhabited 72-acre (29 ha) American island in the Detroit River. It is located just north of Grosse Ile and west of Fighting Island, about 600 feet (180 m) west of the Canada–United States border. The island is part of the city of Wyandotte, in Wayne County. The island is part of the Detroit River International Wildlife Refuge. Grassy Island should not be confused with Grass Island, which is an island of Ontario on the exact opposite side of the Detroit River.
Grassy Island was first charted by French explorers in 1796 as Ile Marecageuse (Marshy Island). At the time, the island's size was only six acres (2.4 ha), and the whole length of the Detroit River was a prominent coastal marshland. During the nineteenth century, the island was primarily used as a fishery and later was home to the Grassy Island Light. From around 1960–1982, the island served as a disposal facility for millions of cubic meters of toxic soil dredged from the nearby River Rouge, and the island's size was increased dramatically. Because of that, the island remains heavily contaminated today.
When Detroit underwent rapid industrialization beginning at the turn at the twentieth century, much of the pollutants from the growing industries found their way into the Detroit River and had devastating consequences on the ecosystem. When the Detroit River became so polluted as to warrant federal intervention, Congress declared Grassy Island and the surrounding area as part of the Wyandotte National Wildlife Refuge in 1961. However, larger shipping lanes were needed in the Detroit River and its main tributary, the River Rouge, with the increase of commercial shipping and larger freighters during this time. The U.S. Army Corps of Engineers took control of Grassy Island from 1960–1982 and used it as a disposal facility for millions of cubic meters of sediments dredged from the nearby River Rouge for better navigation of that river. Dikes were constructed around Grassy Island to hold the sediments— much of which were heavily contaminated from nearby industries.
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