In the 1970s, it was proposed that the Kootenay River be diverted into the Columbia River (the two rivers are separated by a distance of no more than one mile in the Rocky Mountain Trench in southeastern British Columbia). This would allow for the generation of increased hydroelectric power. The proposal was strongly opposed by both environmentalists as well as local residents. The economy of southeastern British Columbia is strongly dependent on tourism, with the Columbia River, including Columbia Lake and
Windermere Lake, being very popular for summer swimming and boating activities. Diversion of the glacier-fed Kootenay River would have resulted in the Columbia River becoming much deeper and colder, flooding lake-side residences and damaging tourism. As a result, this proposed river diversion was never undertaken.