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Dave Marston: A clear warning about the Colorado River

(Brian Maffly  |  Tribune file photo)  Change in water level shows about 90 feet of rock near Bullfrog Bay on Nov. 29, 2018, that has been exposed since Lake Powell has receded.

(Brian Maffly | Tribune file photo) Change in water level shows about 90 feet of rock near Bullfrog Bay on Nov. 29, 2018, that has been exposed since Lake Powell has receded.