Glen Canyon Dam. It took 20 years to fill (including the flood years of 1983 & 1984), but by 2004 (another 20 years), it's at less than half capacity. If the 5 year drought continues 2 more years, Grand Canyon boaters will be taking 20 day trip in duckies on 1000 cfs because the water level behind the dam will be below the power generating intakes.

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