LIGHTHOUSE ISLAND – Mississippi River | Wacouta Bay Sediment loads and the growing island Lighthouse Island has grown about a mile in the last 50 years. The area is notorious for boat groundings. Sediment loads—the size of a city block filled to the height of the Foshay Tower in downtown Minneapolis—accumulate in Lake Pepin every … Continue reading LIGHTHOUSE ISLAND – Sediment | Mississippi River #mudpicnic →