Peterborough Lift Lock
this picture is dedicated to Diane, Linda & Paul :-)
July 30th, Peterborough, ON, Canada
Opened in 1904 with a lift of 18.8 meters, this is the highest hydraulic lift lock in the world and the first one of two built in North America, both on the Trent-Severn Waterway. It operates on a balace principle. A constant water pressure supports each ram trough connecting pipes below ground. When extra water is let into the upper chamber, a connecting valve is opened and the heavier chamber automatically descends, forcing up the lower chamber to start a new cycle.