Lake Athabasca water level

Metres relative to 20th century

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THE GLOBE AND MAIL Source: Wolfe, B. B., T. W. D. Edwards, R. I. Hall, and J. W. Johnston (2011), A 5200‐year record of freshwater availability for regions in western North America fed by high‐elevation runoff, Geophys. Res. Lett., 38, L11404, doi:10.1029/2011GL047599.