The river's drainage basin is 1,300 square kilometres (500 sq mi) in area. Its mean annual discharge is 32.5 cubic metres per second (1,150 cu ft/s).[3]
Course
The Salmo River originates in the Selkirk Mountains south of Nelson. The headwaters are south of Apex summit at the Nelson Nordic Ski Club, just south of Cottonwood Lake and very near the source of Cottonwood Creek. The entire length of the river is 60 km and drains an area of 1,300 square kilometres.[5]Highway 6 parallels the river for the rivers entire length. The Nelson-Salmo Great Northern Trail (Salmo-Troup Rail Trail) also runs alongside the river from its headwaters to the town of Salmo, where the trail diverts west.[6]
The river then reaches the town of Salmo, itself named for the river. In Salmo the river is joined by Erie Creek (historically known as the North Fork of the Salmo), which provides a large portion of the water in the river.[18][19]
South of the Salmo townsite, the river is joined by Sheep Creek. The Salmo River Ranch, a large ranch that is known as the site of Shambhala Music Festival (an annual electronic music festival that takes place at the end of July since 1998) is located on this portion of the riverbank.[20]
The river continues south to the southern junction of highways 3 and 6 where it is joined by the South Salmo River as that river flows west out of Stagleap Provincial Park. The South Salmo river also contributes a lot of flow to the Salmo.[21]
Once the South Salmo joins the main stem, the river turns west and flows for a few kilometres before finally discharging into the Pend d'Oreille River just north of the Canada–United States border at the ghost town of Remac.[22]
The river is very popular amongst locals especially in the summer months. The rivers winding path through rocky mountains has created numerous swimming holes along the rivers' length especially suited for swimming. The rivers mouth at the Pend d'Orielle (where it enters the reservoir formed by the Seven Mile Dam) is at the entrance to a BC Hydro Recreation Area known as the "Pend d'Oreille Valley Wildlife Conservation Area" or the Pend d'Orielle Recreation Area.[23] The area is popular for backcountry camping and swimming amongst locals.