Beaver River has a catchment area of 14,500 square kilometres (5,600 sq mi) in Alberta,[4] where it drains the lake system in Lac La Biche County.Its source, Beaver Lake is just south of Lac la Biche which drains into the Athabasca.From at least 1795 buffalo pemmican was brought north to feed the voyageurs on their way to the Athabasca Country.One route led south to the great bend of the Beaver, through Green Lake, Saskatchewan, and over an Indian track to Fort Carlton.In 1799 the Hudson's Bay Company decided to push west up the Churchill from Frog Portage.They also built a post above the great bend at Meadow Lake, Saskatchewan, that only lasted two years.