St. Marys River (Michigan–Ontario) arch bridge, takes road traffic across the river. Directly to the west is the Sault Ste. Marie International Railroad Bridge, which carries rail traffic on a single set of tracks. The Edison Sault Electric Hydroelectric Plant, located at the eastern end of the Sault Ste. Marie Power Canal which runs between Lake Superior and Lake Huron through the city south of the American locks, is one of the longest hydroelectric plants in the world at in length. The plant consists of 74 three-phase generators capable of generating 25 to 30 megawatts. It was completed in 1902. The hydro plant is
Sault Ste. Marie, Michigan from in January to in July. On average, only two out of every five years reaches , while there are 85.5 days annually where the high remains at or below freezing and 26.5 nights with a low of or colder. Average monthly precipitation is lowest in February, and highest in September and October. This autumn maximum in precipitation, unusual for humid continental climates, owes to this area's Great Lakes location. From May through July (usually the year's wettest months in most of the upper Midwestern United States, away from large bodies of water), the lake waters surrounding Sault Ste. Marie