Soo Locks, Sault Ste. Marie
Affectionately called the “Linchpin of the Great Lakes” by the United States Army Corps of Engineers, the Soo Locks are a remarkable feat of engineering and human ingenuity that connect Lakes Superior and Huron. The locks operate by raising and lowering boats between the levels of Lake Superior and the lower Great Lakes using a series of gates and chambers. Water and boats are moved solely by the force of gravity. The Soo Locks date back to the mid-1800s and are a popular tourist destination, attracting an estimated 500,000 visitors annually.
The Soo Locks, located on the St. Marys River, allow freighters to navigate between Lake Superior and the lower Great Lakes, the St. Lawrence Seaway, and international markets. This essential transportation link moves nearly 86 million tons of cargo annually, including 95% of the United States’ iron ore.
Most ships utilize the Poe Lock, which was rebuilt in 1968 to accommodate larger and more modern ships. The MacArthur Lock, which is closest to Sault Ste. Marie, is also still in operation and was named after General Douglas MacArthur. The Davis and Sabin Locks were built in 1914 and 1919 respectively, but currently, only the Poe and MacArthur Locks are operational. However, construction of a new Soo Lock is currently underway, which will be the same size as the Poe Lock.
Construction of a new Soo Lock began in 2019, and it is expected to take up to 10 years to complete. The project as of 2023 now costs $3.22 billion, more than three times its initial price tag, due to labor shortages, supply chain disruptions, and material cost increases over the past four years. The new lock will be built adjacent to the Poe Lock and will be the same size, allowing for more efficient traffic flow and reducing delays. The project is seen as critical to the U.S. economy and national security, as the Great Lakes shipping industry is a vital part of the country’s transportation infrastructure. The new Soo Lock will ensure continued reliable and safe navigation of goods and materials through the Great Lakes, helping to support economic growth and maintain the region’s competitiveness in global markets.
For an animated illustration of how a lock works, see https://saultstemarie.com/attractions/soo-locks/
Affectionately called the “Linchpin of the Great Lakes” by the United States Army Corps of Engineers, the Soo Locks are a remarkable feat of engineering and human ingenuity that connect Lakes Superior and Huron. The locks operate by raising and lowering boats between the levels of Lake Superior and the lower Great Lakes using a series of gates and chambers. Water and boats are moved solely by the force of gravity. The Soo Locks date back to the mid-1800s and are a popular tourist destination, attracting an estimated 500,000 visitors annually.
The Soo Locks, located on the St. Marys River, allow freighters to navigate between Lake Superior and the lower Great Lakes, the St. Lawrence Seaway, and international markets. This essential transportation link moves nearly 86 million tons of cargo annually, including 95% of the United States’ iron ore.
Most ships utilize the Poe Lock, which was rebuilt in 1968 to accommodate larger and more modern ships. The MacArthur Lock, which is closest to Sault Ste. Marie, is also still in operation and was named after General Douglas MacArthur. The Davis and Sabin Locks were built in 1914 and 1919 respectively, but currently, only the Poe and MacArthur Locks are operational. However, construction of a new Soo Lock is currently underway, which will be the same size as the Poe Lock.
Construction of a new Soo Lock began in 2019, and it is expected to take up to 10 years to complete. The project as of 2023 now costs $3.22 billion, more than three times its initial price tag, due to labor shortages, supply chain disruptions, and material cost increases over the past four years. The new lock will be built adjacent to the Poe Lock and will be the same size, allowing for more efficient traffic flow and reducing delays. The project is seen as critical to the U.S. economy and national security, as the Great Lakes shipping industry is a vital part of the country’s transportation infrastructure. The new Soo Lock will ensure continued reliable and safe navigation of goods and materials through the Great Lakes, helping to support economic growth and maintain the region’s competitiveness in global markets.
- The Soo Locks are 100% gravity-fed and require no pumps.
- To lift or lower a boat, the Poe Lock alone requires an astonishing 22 million gallons of water.
- During repairs, the locks are closed from January 15 to March 25 each year.
- The bedrock beneath the locks is 1,000 feet thick and is made from reddish sandstone.
- It would take 584 train cars to move 70,000 tons of cargo or one 1,000ft freighter.
- The Paul R. Tregurtha is the largest freighter that uses the Poe Lock. It measures in at 1,013.5′ feet long and 105′ wide.
For an animated illustration of how a lock works, see https://saultstemarie.com/attractions/soo-locks/
© David D. Dolton