The Nass River is a river in northern British Columbia, Canada. It flows from the Coast Mountains southwest to Nass Bay, a sidewater of Portland Inlet, which connects to the North Pacific Ocean via the Dixon Entrance. Nass Bay joins Portland Inlet just south of Observatory Inlet. The English name "Nass" is derived from the Tlingit name Naas which means "intestines" or "guts" in reference to the river's large food capacity in its fish. Can also be a Tlingit word for "food depot". Former spellings are Naas and Nasse. The Nisga'a name for the river is K'alii Aksim Lisims "Lisims Valley". The Gitxsan name is Git-Txaemsim meaning People of Txeemsim. Lisims means "murky" in Nisga'a, referring to the river's silt-laden flow. The last of the river are navigable. The river is a commercially valuable salmon fishery. The basin of the Nass is the location of the first modern-day treaty settlement in British Columbia, between the government of that province and the Nisga'a Nation. The name Nisga'a is a reduced form of, which is a loan from Tongass Tlingit, where it means "people of the Nass River".
History
About 220 years ago, as recorded by the oral history of the Nisga'a people, the Nass River was dammed by a 22.5 km long lava flow which came from the Tseax Cone and destroyed the Nisga'a villages and caused the death of at least 2000 Nisga'a people by volcanic gas and poisonous smoke. The volcano has been active on at least two occasions in the last millennium. Because of our knowledge of this previous disaster, modern ing techniques should include studies of the gases emitted by the volcanoes and the institution of a warning system to alert people living down slope from the volcanoes.
Hazards
If the Tseax Cone were to erupt again, there could be a repeat of the poisonous gas disaster that happened to the Nisga'a people 220 years ago. The eruption could also cause forest fires and could potentially dam local rivers such as the Nass River and the Tseax if the volume of the lava flows are large enough. If the lava flows were to again reach the Nass River, it could have disastrous short-term consequences for the important salmon fisheries on the Nass River system.
Tributaries
This is an incomplete list of tributaries, in upriver order:
