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
Lake Creek (Siuslaw River) Lake Creek (Siuslaw River) Lake Creek is a major tributary of the Siuslaw River in Lane County in the U.S. state of Oregon. On average, the long creek contributes about a third of the lower Siuslaw's water volume. Beginning near Prairie Mountain near the Lane–Benton county border in the Central Oregon Coast Range, Lake Creek flows generally southeast through the Siuslaw National Forest to the vicinity of Horton, then southwest through the communities of Blachly, Triangle Lake, Greenleaf, and Deadwood. It enters the Siuslaw River at Swisshome, by water from the larger stream's mouth on the Pacific Ocean at Florence.