The Soo Locks have been referred to as one of the great wonders of the world and are still the largest & one of the busiest waterway traffic systems on earth! Watching huge vessels pass through the Locks is a unique experience that cannot be seen anywhere else in the United States! The Locks consist of two canals and four locks that allow vessels of many types/sizes to safely traverse the 21-foot drop in elevation of the St. Mary’s River between Lake Superior and Lakes Michigan and Huron. From viewing decks, you can watch "Lakers" and "Salties" (ocean-going vessels) as they travel the seaway between ports and navigate the rise/drop of the water levels. The Soo Locks Park Visitors Center, open from 9am - 9pm mid-May thru mid-October each year. We also have schedules of arriving vessels along with general information.