Duluth, MN (KDAL) - Our wet spring has led the International Lake Superior Board of Control to further open the gates at the head of the St. Mary’s Rapids. In mid-May the board decided to open the gates. Since then, they say significant rainfall has resulted in Lake Superior rising by over six inches above average. Down river, the levels of both Lake Michigan and Lake Huron are five-and-a-half inches below average. By opening the gates further, the board says it will reduce the risk of extremely high water levels on Lake Superior. It will also help to bring the levels of Lakes Huron and Michigan up. If the weather continues to be wetter than normal, the board could decide to further open the gates later this summer.