Incomappleux River

Incomappleux River
Incomappleux inland rainforest
Location in British Columbia
Location
Country	Canada
Province	British Columbia
District	Kootenay Land District
Physical characteristics
Source	Illecillewaet Neve
• location	Selkirk Mountains
Mouth	Columbia River
• location	Upper Arrow Lake
• coordinates	50°44′48″N 117°42′47″W / 50.74667°N 117.71306°W / 50.74667; -117.71306[1]
Basin size	1,020 km2 (390 sq mi)[2]
Discharge
• location	near Beaton[2]
• average	55.8 m3/s (1,970 cu ft/s)[2]
• minimum	4.76 m3/s (168 cu ft/s)
• maximum	570 m3/s (20,000 cu ft/s)
Basin features
Progression	Incomappleux Valley

The Incomappleux River is in the West Kootenay region of southeastern British Columbia, Canada. Entering the Beaton Arm of Upper Arrow Lake, the river is a major tributary of the Columbia River. The upper reaches of the Incomappleux valley are home to some of the only inland temperate rainforest in the world.

The area has been studied since 2000 by Valhalla Wilderness Society as a part of their Inland Temperate Rainforest campaign, and the upper Incomappleux was included in the Selkirk Mountain Caribou Park proposal after groundbreaking biodiversity research by biologists Toby Spribille and Curtis Björk, sponsored by Valhalla Wilderness Society, found over 300 species of lichens in the Incomappleux, most of them in the ancient forest. This included seven species new to science. The Incomappleux Valley has been the subject of two films, one by Riel Marquardt, and more recently the VWS film Primeval: Enter the Incomappleux, by award winning documentary filmmaker, Damien Gillis. VWS Director Craig Pettitt and biologist Amber Peters toured the province with the film. The Incomappleux Valley was declared a conservancy in 2023 but the remainder of the Selkirk Mountain Caribou Park proposal, containing critical old growth inland rainforest corridors still remains unprotected. The valley is in the traditional territory of the Sinixt First Nation and its protection was supported by the autonomous Sinixt.