Between April 2020 and April 2021, habitat restoration work on 8.4 acres of Interstate Island in the Duluth-Superior harbor enhanced the island’s nesting area for the common tern. The island’s tern population had been reduced by roughly 50% due to high water levels and flooding and an increase in the number of ring-billed gulls, a natural predator of terns. The restoration work included creating nesting space on the island at a higher elevation to protect from flooding. The U.S. Army Corps of Engineers also doubled the size of the island by repurposing clean dredge materials from annual maintenance dredging in the harbor.
July 21, 2021