The meltwater from the Hoodoo Glacier drains into the Hoodoo River while meltwater from the Twin Glacier drains into the Twin River. These two relatively small rivers are a source for the much larger Iskut River, flowing from the southern flank of Hoodoo Mountain respectively. Runoff from the Hoodoo and Twin glaciers and those on surrounding mountains is a source of fresh water for major salmon habitats and fisheries on the Iskut and Stikine rivers.