The Michigan DNR depends on sea lamprey control forthe success of its fishery management program. Without sea lamprey control, the state would not achieve its fishery objectives. A sea lamprey infestation of the Grand River and its tributaries would harm the entire Lake Michigan fishery and probably harm Lake Huron. The proposed AHS barrier will prevent the spread of sea lampreys into the Grand River and its tributaries upstream of Grand Rapids and, therefore, is integral to the DNR’s objectives of reducing the number of sea lampreys in the Great Lakes.