Climate, Streamflow, and Lake-Level Trends in the Great Lakes Basin of the United States and Canada, Water Years 1960-2015 [open pdf - 23MB]
From the Document: "This report by the U.S. Geological Survey in cooperation with the Great Lakes Restoration Initiative was completed to describe trends in climate, streamflow, lake levels, and major water-budget components within the Great Lakes Basin for water years (WYs) 1960-2015 (study period). Resulting trends are applicable only to the study period and should not be considered indicative of longer-term trends."
Scientific Investigations Report 2019-5003
U.S. Geological Survey: https://www.usgs.gov/