Ottawa River

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The Ottawa River (French: Rivière des Outaouais) is a river in the Canadian provinces of Ontario and Quebec. For most of its length, it now defines the border between these two provinces.



The river rises from its source in Lake Capimitchigama, in the Laurentian Mountains of central Quebec, and flows west to Lake Timiskaming. From there its route has been used to define the interprovincial border with Ontario.

From Lake Timiskaming, the river flows southeast to Ottawa and Gatineau, where it tumbles over the Chaudière Falls and further takes in the Rideau and Gatineau rivers.

The Ottawa River drains into the Lake of Two Mountains and the St. Lawrence River at Montreal. The total length of the river is 1,271 kilometers (790 mi); it drains an area of 146,300 km2, 65% in Quebec and the rest in Ontario, with a mean discharge of 1,950 m3/s.[1]

The average annual mean waterflow measured at Carillon dam, near the Lake of Two Mountains, is 1,939 m3/s, with average annual extremes of 749 to 5,351 m3/s. Record historic levels since 1964 are a low of 529 in 2005 and a high of 8190 m3/s in 1976.[2]

Major tributaries include:

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