Between 2010 and 2014, the average annual water runoff from the Great Lakes totaled around *** millimeters over the lakes' surfaces. Both decreased and increased water levels have at times been reason for concern for the Great Lakes at both extremes.
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GLERL. (January 1, 2016). Average hydrological input and output of the Great Lakes from 1965 to 2014 (in millimeters) [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved July 24, 2026, from /statistics/1081495/great-lakes-hydrology/
GLERL. "Average hydrological input and output of the Great Lakes from 1965 to 2014 (in millimeters)." Chart. January 1, 2016. ÌÇÐÄÆƽâ°æ. Accessed July 24, 2026. /statistics/1081495/great-lakes-hydrology/
GLERL. (2016). Average hydrological input and output of the Great Lakes from 1965 to 2014 (in millimeters). ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: July 24, 2026. /statistics/1081495/great-lakes-hydrology/
GLERL. "Average Hydrological Input and Output of The Great Lakes from 1965 to 2014 (in Millimeters)." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 1 Jan 2016, /statistics/1081495/great-lakes-hydrology/
GLERL, Average hydrological input and output of the Great Lakes from 1965 to 2014 (in millimeters) ÌÇÐÄÆƽâ°æ, /statistics/1081495/great-lakes-hydrology/ (last visited July 24, 2026)
Average hydrological input and output of the Great Lakes from 1965 to 2014 (in millimeters) [Graph], GLERL, January 1, 2016. [Online]. Available: /statistics/1081495/great-lakes-hydrology/
