An area that would be under water if the lake was full is seen in Lake Powell near Page, Arizona, May 26, 2015. 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. (Photo by Rick Wilking/Reuters)





Huge areas of dry ground which would be under water when the lake is full are seen at Lake Powell near Page, Arizona, May 26, 2015. (Photo by Rick Wilking/Reuters)





A boat makes its way around Padre Butte in Lake Powell near Page, Arizona, May 26, 2015. (Photo by Rick Wilking/Reuters)





The Glen Canyon dam holds back the Colorado River creating Lake Powell near Page, Arizona, May 26, 2015. (Photo by Rick Wilking/Reuters)





Gregory Butte is reflected in Lake Powell near Page, Arizona, May 25, 2015. (Photo by Rick Wilking/Reuters)





A power boat cruises though Cathedral Canyon, part of Lake Powell, near Page, Arizona, May 27, 2015. (Photo by Rick Wilking/Reuters)





A barge carries a propane truck on Lake Powell near Page, Arizona, May 27, 2015. (Photo by Rick Wilking/Reuters)





Houseboats are tied up in the marina at Lake Powell near Page, Arizona, May 26, 2015. (Photo by Rick Wilking/Reuters)





Huge areas of dry ground which would be under water when the lake is full are seen at Lake Powell near Page, Arizona, May 26, 2015. (Photo by Rick Wilking/Reuters)





A houseboat is tied up on shore as two jet skis approach below Gunsight Butte in Lake Powell near Page, Arizona, May 26, 2015. (Photo by Rick Wilking/Reuters)





The high water mark, seen as a white line, lines the shore of Lake Powell near Page, Arizona, May 26, 2015. (Photo by Rick Wilking/Reuters)





A houseboat camps on the shore in shallow water in a canyon at Lake Powell near Page, Arizona, May 26, 2015. (Photo by Rick Wilking/Reuters)





A power boat cruises with Phoebe the dog on the bow, through a cut below Castle Rock in Lake Powell near Page, Arizona, May 25, 2015. (Photo by Rick Wilking/Reuters)





The Glen Canyon dam (background) holds back the Colorado River creating Lake Powell near Page, Arizona, May 26, 2015. (Photo by Rick Wilking/Reuters)





The Glen Canyon dam holds back the Colorado River creating Lake Powell near Page, Arizona, May 26, 2015. (Photo by Rick Wilking/Reuters)





Huge areas of dry ground (background) which would be under water when the lake is full are seen at Lake Powell near Page, Arizona, May 26, 2015. (Photo by Rick Wilking/Reuters)





A houseboat camps on the shore in shallow water in a canyon at Lake Powell near Page, Arizona, May 26, 2015. (Photo by Rick Wilking/Reuters)





A jet ski spins through Lake Powell with houseboats tied up in the marina near Page, Arizona, May 26, 2015. (Photo by Rick Wilking/Reuters)





Dry land (R) that would be under water when the lake is full is seen next to Gregory Butte in Lake Powell near Page, Arizona, May 26, 2015. (Photo by Rick Wilking/Reuters)





A power boat moves through a canyon at Lake Powell near Page, Arizona, May 26, 2015 with the high water mark visible above it. (Photo by Rick Wilking/Reuters)





A narrow slot canyon is seen from the air at Lake Powell near Page, Arizona, May 26, 2015. (Photo by Rick Wilking/Reuters)





Sandstone sculpted by water and wind erosion is seen in a slot canyon, one of hundreds that surround Lake Powell near Page, Arizona, May 26, 2015. (Photo by Rick Wilking/Reuters)





Sandstone sculpted by water and wind erosion is seen in a slot canyon, one of hundreds that surround Lake Powell near Page, Arizona, May 26, 2015. (Photo by Rick Wilking/Reuters)