Lake Powell on the Colorado River provides water for Nevada, Arizona and California. A severe drought in recent years, combined with withdrawals that many believe are not sustainable, has reduced its levels to only about 42 percent of its capacity.
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A houseboat camps on the shore in shallow water in a canyon at Lake Powell near Page, Arizona.
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Lake Powell in the United States is seen in a combination of NASA satellite images taken in 1991 (L) and 2015 (R).
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Sandstone sculpted by water and wind erosion is seen in a slot canyon, one of hundreds that surround Lake Powell.
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Huge areas of dry ground which would be under water when the lake is full are seen at Lake Powell.
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The Glen Canyon dam holds back the Colorado River creating Lake Powell.
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Houseboats are tied up in the marina at Lake Powell.
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A boat makes its way around Padre Butte in Lake Powell.
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A power boat cruises with Phoebe the dog on the bow, through a cut below Castle Rock in Lake Powell.
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An area that would be under water if the lake was full is seen in Lake Powell near Page, Arizona.
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A power boat moves through a canyon at Lake Powell near Page, Arizona, May 26, 2015 with the high water mark visible above it.