“The river is not just dropping the sediment into a bathtub,” one researcher said, “it’s actively modifying the bottom of the tub and filling it up as well.”
Researchers at the University of Utah and the U.S. Geological Survey are studying how the sediment is impacting the reservoir.
Then, when the river meets the reservoir, everything goes still. Flocks of white pelicans alight on sandbars where the current ends. A separate delta is moving down the San Juan River to the south, a tributary to the Colorado that carries less water but more sediment. “We’re seeing pretty remarkable rates of change in where that delta front was sitting,” Johnson said, “on the order of 10, 20 kilometers [six to 12 miles] in a year, or in a couple of years, moving up or down.”
In the span of four months, the delta had moved by nearly 12 miles. Hartley has continued to research the delta movement with Johnson since completing the class project.
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