The Rideau Canal was a real marvel of modern engineering when it was first built. Running from Lake Ontario at Kingston to Ottawa, the Canal runs for over 200km and climbs 50 metres along the way, and then drops another 80 metres before it empties into the Ottawa River.
This graphic is a profile of the Rideau Canal, showing how the locks and dams regulate the water levels between Lake Ontario (at 74.0 metres above sea level), the summit at Upper Rideau Lake (at 124.65 metres above sea level) and the Ottawa River (at 40.8 metres above sea level).
The watershed divide is at Newboro (a bedrock ridge separating Upper Rideau Lake from Newboro Lake). Water from Upper Rideau Lake flows north to the Ottawa River, water from Newboro Lake flows south to Lake Ontario (Kingston) and to the St. Lawrence River (Gananoque).
While Upper Rideau Lake is the highest part of the Rideau Canal, it is not the top of the watershed. Water flows into Upper Rideau Lake from higher up on the Rideau River Watershed and water flows into Newboro Lake from higher up on the Cataraqui River Watershed. For a look at the watersheds and how they changed with the building of the Rideau Canal see the watersheds section of the Rideau Route.
For specific information on the lift of each individual lock, consult the Rideau Waterway Statitics Page.
The more you know…