Mackenzie River from the Peace-Athabasca system are significantly slowed by the delta area at the western end of Lake Athabasca causing the lake to rise, and the excess water can only flow out after the rivers have receded. The same phenomenon occurs at Great Slave Lake, which naturally regulates the flow from the Slave River into the Mackenzie. There are river gages at several upstream points along the Mackenzie River. The average flow rate at the outlet of Great Slave Lake is . At Fort Simpson, below the Liard River, it is . At Norman Wells it is , and at the
Albreda Lake shore of the lake. Albreda Lake Albreda Lake is a lake in Thompson-Nicola Regional District in the Interior region of British Columbia, Canada. It is in the Pacific Ocean drainage basin. The primary inflow, at the northeast, and outflow, at the southeast, is the Albreda River, which flows via the North Thompson River, the Thompson River and the Fraser River to the Pacific Ocean. The locality of Albreda is to the north, and both British Columbia Highway 5 and the Canadian National Railway transcontinental main line (used by freight traffic and the Via Rail "Canadian" train) pass by to the