Marine traffic on the St. Marys River in Sault Ste. Marie, Michigan will not be allowed within 1,000 feet (shown in blue) at the time of any blast detonations for recreational boats, fishermen, swimmers, and general waterborne public. Red Flag Vessels, transporting bulk fuel or other hazardous materials, will not be allowed within 2,000 feet (shown in red) during blasts. The graphic shows the blasting location and affected marine vessel areas for 2025 work.