The Travels of Tug 44

Peterborough Lift Lock - Ontario

The Peterborough Lift Lock is also known as Lock 21 of the Trent-Severn Waterway, near Peterborough Ontario, Canada. It provides a 65 foot lift. This view is the lower entrance, and shows the left chamber in the down position, and the right chamber in the up position. Below the right chamber one can see the piston which lifts the giant water box. Each chamber has such a piston, and they are connected, so they operate as a counterbalance to each other. The lock-keeper need only add a small amount of water to the upper water box and it will begin to descend, and push the other box upwards.

This side view shows the right water box lifted to the upper canal level. The left box is submerged in the lower level of the canal. Each box has doors on each end, so that boats can enter and exit at the appropriate level. This lift lock was built in 1904 and remains in service today.

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