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Detroit Island
Detroit Island.jpg
Facing the northern side of the island from the harbor
Geography
Location Door County, Wisconsin
Area 637.12 acres (257.83 ha)
Highest elevation 594 ft (181.1 m)
Administration
State Wisconsin
County Door County
Town Washington Island

Detroit Island is a mostly privately owned island in Lake Michigan in the southern part of the town of Washington in Door County, Wisconsin, United States. The island has a land area of 2.578 km² (0.9955 sq mi, or 637.12 acres). The northern end of the island borders the waters of Detroit Harbor.

Grand Traverse Island State Park was founded in 1970 and protects sightly more than 5 acres (2.0 ha) of land on Detroit Island. It consists of five discontiguous parcels and there is no ferry access.

History

Fishermen working with nets on Detroit Island Wisconsin
Fishermen working with nets on Detroit Island; from a postcard postmarked in 1909

The border between Wisconsin and Michigan was originally defined as "the most usual ship channel" into Green Bay from Lake Michigan but commercial routes existed both to the north and south of the island which lead to a border dispute. In 1936, the U.S. Supreme Court decision Wisconsin v. Michigan found that Detroit and three other islands were part of Wisconsin.

Nearby islands

Plum Island Pilot Island Detroit Island and Southern Washington Island Wisconsin
Detroit Island is the long and narrow island at center-right. Beneath Detroit Island on the right is the much smaller Pilot Island, with Plum Island is at the lower left. Washington Island is in the distance.
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