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Deming Lake is a lake in Hubbard County and Clearwater County, Minnesota, in the United States. It is within Itasca State Park.

Deming Lake was initially named 'Danger Lake' by Peter Turnbull, a land surveyor and civil engineer from Canada, because of water "flooding the ice surface in winter at its south shore". It was renamed after Portius C. Deming, a state park official who was later the President of the Minneapolis Board of Park Commissioners.

Role in understanding past climate
Pollen core s taken from Deming Lake indicate that vegetation around the lake and Itasca region has changed in response to past climate changes. The area was a prairie ecosystem from approximately 8000 to 5400 years ago, an Oak savannah from approximately 5400 to 3300 years ago and currently lies in a Pine forest ecosystem.