Nov 26, 2002 — For more than a hundred years, man has made changes to rivers and lakes. Locks, dams and redirecting waterways has raised water levels and increased river flows. One effect has been the near disappearance of islands that once provided habitat for fish, plants and birds. Some groups are trying to rebuild those islands. But the concept of a man-made island is not universally accepted. The Great Lakes Radio Consortium's Jonathan Ahl reports.