Upper South Branch Thunder Bay River
General data
- Name: Upper South Branch Thunder Bay River
- Water system: St. Lawrence River
- Water type: River
- Progression: Thunder Bay River -> Lake Huron -> St. Clair River -> Lake St. Clair (North America) -> Detroit River -> Lake Erie -> Niagara River -> Lake Ontario -> St. Lawrence River -> Gulf of St. Lawrence -> Atlantic Ocean -> Planet Earth
- Climates: Continental
- Continents: North America
- Countries: United States of America
The Upper South Branch of the Thunder Bay River is a sub-watershed in Michigan that is part of the larger Thunder Bay River system, which drains into Thunder Bay on Lake Huron. It is home to an elk herd and has undergone restoration projects to improve its ecosystem, such as reducing sediment and pollution from road runoff.