Gregoire Lake is a lake in Alberta, Canada. It is part of the Athabasca River basin. It is located in the wetlands of northern Alberta, adjacent to Highway 881, between Fort McMurray and Lac La Biche. It was known as "Willow Lake" until 1940 when the name was changed to "Gregoire Lake". Then renamed Willow Lake in 1992 at the request of local residents. https://www.rmwb.ca/en/mayor-council-and-administration/resources/Documents/AreaStructurePlans/Willow-Lake-ASP.pdf The lake has a total area of 25.8 km2 and lies at an elevation of 480 m. It has a maximum depth of 7.2 m and an average depth of 3.9 m. Gregoire Lake Provincial Park is established on the northern shore of the lake, which is a traditional territory of Woodland Cree and Chipewyan First Nations.