Geography of Alberta - Water

Water

With the exception of the southern section, the province of Alberta may be said to be well watered. Rising from numerous valleys on the Alberta declivity of the Rocky Mountains between the international boundary line and 52° north are streams which unite to form the Oldman River, and farther north the Bow River. Running eastward these two rivers unite about 112° west, and flow on under the name of the South Saskatchewan River. North of 52° north many small streams unite to form the Red Deer River, which flowing southeastward joins the South Saskatchewan near 110° west. Between 52° and 53° north rises the great river, the North Saskatchewan. It receives a southern tributary, the Battle River, which joins it about 108° west. Pursuing their courses eastward the North and South Saskatchewan rivers unite in the Saskatchewan River (Cree, rapid-flowing river), which finds its way to Lake Winnipeg, and thence by way of Nelson River to Hudson Bay. It is one of the mightiest rivers of the continent.

At Mount Athabasca, there is an unusual occurrence where the water flows either to the Pacific Ocean on the western slope, the Arctic Ocean on the northeast, and the Atlantic Ocean on the southeast.

In the northern part of the province, between 53° and 54° north, all the waters of Alberta flow toward the Arctic Ocean. Starting at Mount Athabasca, the Athabasca River runs north and empties into Lake Athabasca near 58° north. North of 56° north flows through and from the Rocky Mountains as the Peace River. After descending northeastward to within a few miles of Lake Athabasca, it is met by a stream emerging from that lake. The united river carrying down the waters of the Athabasca slope is called the Slave River, which, passing through Great Slave Lake, emerges as the great Mackenzie River, which falls into the Arctic Ocean. Alberta thus gives rise to the two great rivers, the Saskatchewan and the Mackenzie.

While a number of fresh water, or in some cases brackish, lakes each less than 260 km² (100 mi²) in extent are situated in Alberta, two of more considerable size are found. These are Lake Athabasca, 7898 km² (3085 mi²) in extent, of which the greater part is in the province of Saskatchewan, and the other Lesser Slave Lake 1,160 km² (600 mi²) in area.