Dive Curacao

Scuba Mask Straps

Learn More About Diving Lock 21 at Cornwall Canal

Pinterest LinkedIn Tumblr +

Lock 21 is located at the upper entrance to the 11-mile-long Cornwall Canal, which was built to avoid the Great Sault Rapids. The lock is on the south side of the island on St. Lawrence Lake not on the St. Lawrence River. It was built in 1885/86 as part of a second canal system expansion, and it is 270 feet long between the gates, 45 feet wide, and has 14 feet clearance over the sill. The lock was operated by the Department of Railways and Canals until 1936, when it was taken over by the Department of Transport when the area was flooded to serve as the headwater for the Cornwall Hydro dam.

Lock 21
Lock 21, Circa 1921. Original Photo Credit Unknown

Dive Particulars

  • A dive light is mandatory
  • Be advised of a strong current::2-3 knots
  • Lock Bottom is 60 feet, while upperwork is 40 feet
  • On a good day, visibility is 8-12 feet
  • Lines are available, placed by divers

Lock 21 is an exciting and one-of-a-kind dive that takes you back in time to a 19th century submerged Victorian canal lock on the St. Lawrence River.

The St. Lawrence Parks Commission manages the Parkway’s facilities. Picnic tables are available, as well as a snack bar, restrooms, a nature trail, and camping facilities.

YouTube Video Fishfinders 2015


Blue Horizon

About Author

Kathy is the owner of Kirk Scuba Gear, a passionate Scuba Diver, Ocean Advocate and Managing Editor of The Scuba News Canada

Leave a Reply

Dive Curacao

Scuba Mask Straps