Gravel Island
Mayville, WI 53050-1931
Plan Your Visit
The refuge is closed to public access. Boaters are asked to stay at least a quarter mile offshore so as not to endanger the nesting areas.
Gravel and Spider islands were protected in 1913 by an Executive Order with the intent to preserve breeding habitat for colonial nesting birds such as herring gulls, cormorants and Caspian terns. For this reason, these wilderness islands are closed to public visitation consistent with the conservation purpose of the refuge.
Get Involved
National wildlife refuges provide many opportunities for you to help your community by doing what you love. National wildlife refuges partner with volunteers, youth groups, landowners, neighbors and residents of urban and coastal communities to make a lasting difference.
About
Gravel Island and Spider Island comprise the Gravel Island National Wildlife Refuge in Lake Michigan. Established in 1913, the refuge protects breeding habitat for colonial nesting birds, including the Great Lakes' largest Caspian tern colony. In 1970, the islands were designated as part of the Wisconsin Islands Wilderness Area. The refuge remains closed to public visitation to ensure the continued protection of nesting bird populations.