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In page Geology of the Grand Canyon area:
"Controlling river flow by use of dams has diminished the river's ability to scour rocks by substantially reducing the amount of sediment it carries.[4] Dams on the Colorado River have also changed the character of the river water. Once both muddy and warm, the river is now clear and averages a 46 °F (8 °C) temperature year-round.[4] Experimental floods approaching the 48,200 cubic feet (1,360 m3) per second level mentioned above have been carried out in 1996 and 2004 to study the effects on sediment erosion and deposition.[5]
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