Lake Gratiot
General data
- Name: Lake Gratiot
- Water system: St. Lawrence River
- Water type: Natural lake
- Progression: Little Gratiot River -> Lac La Belle (Michigan) -> Mendota Canal -> Lake Superior -> St. Marys River (Michigan–Ontario) -> 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
Lake Gratiot is a 1,438-acre (582 ha) lake in Keweenaw County, Michigan. The lake is surrounded by dense forest of the Keweenaw Peninsula. The bottom is mainly muck and it has a maximum depth of 70 feet (21 m). The lake flows through the Little Gratiot River into Lac La Belle and then into Lake Superior.