Southern St. Clair County residents and tourists traveling to Canada may have to go the long way around - through Port Huron and over the Blue Water Bridge - to get to Ontario and back. The Bluewater International Ferry, which is located just east of state highway M-29, provides the fastest, most convenient rout to Canada, but, due to high marine service fees, ferry management is threatening to close for the winter. The Canadian-owned Bluewater Ferry docks in Sombra, Ontario, and Marine City. Ferry manager Capt. Morgan Dalgety said exorbitant ice-breaking charges from the Canadian Coast Guard's Oceans and Fisheries Division are putting a financial squeeze on the company.