CARSON CITY, Nev. (AP) — Six states in the U.S. West that rely on the Colorado River to sustain cities and farms rebuked a plan to build an underground pipeline that would transport billions of gallons of water through the desert to southwest Utah.

In a joint letter Tuesday, water officials from Arizona, California, Colorado, Nevada, New Mexico and Wyoming urged the U.S. government to halt the approval process for the project, which would bring water 140 miles (225 km) from Lake Powell in northern Arizona to the growing area surrounding St. George, Utah.

The Glen Canyon Dam, near the town of Page, Arizona is pictured on August 25, 2020. Glen Canyon Dam is a 710-foot (220 m) high dam that forms Lake Powell, one of the largest man-made reservoirs in the U.S. (credit: Daniel Slim/AFP via Getty Images)

If the approval moves forward, state water leaders wrote, “multiyear litigation” would likely be inevitable and could complicate negotiations over the future of the Colorado River, which serves 40 million people but faces threats from persistent drought and climate change that are dwindling the supply of water.

“That is not a recipe for creating the kind of meaningful and positive change needed to sustain the Colorado River in the coming decades,” they wrote.

The Lake Powell Pipeline project would divert 86,000 acre-feet (106 billion liters) of water to Washington County, Utah. The state is entitled to the water under agreements between the states that date back a century, but the project’s critics worry the pipeline could further deplete Lake Powell — one of the two man-made reservoirs where Colorado River water is stored.

Water lines are visible on a section of Lake Powell that used to be under water on March 30, 2015 near Big Water, Utah, in this 2018 photo. The Colorado River Basin supplies water to 40 million people in seven western states. (credit: Justin Sullivan/Getty Images)

If water levels in either Lake Powell or the other reservoir — Lake Mead — fall farther, states could be forced to limit the amount of water they can send to growing cities like Phoenix and Las Vegas and farmers throughout the region that help stock supermarkets.

Under the agreements between the seven states, cuts would hit Arizona, California and Nevada before affecting Colorado, New Mexico, Utah and Wyoming.

The government received more than 10,000 public comments on an environmental impact report for the proposed pipeline before Tuesday’s deadline, U.S. Bureau of Reclamation spokesman Marlon Duke said. The Interior Department, which oversees the bureau, is expected to issue a final report, which could bring the project a step closer to approval.

In the letter, state water leaders argue that legal and operational issues haven’t been resolved and “that work is undeniably best undertaken” through negotiations between the states rather than lawsuits. They asked Interior Secretary David Bernhardt to delay approving the final environmental impact statement.

Although the proposal isolates Utah from the other states that rely on the river, it’s committed to bringing water it’s entitled to tap to those who need it, said Todd Adams, director of the Utah Division of Water Resources.

Tourists enjoy the view of the Horseshoe Bend, a shaped incised meander of the Colorado River, located in the town of Page, Arizona, on August 24, 2020. (credit: Daniel Slim/AFP via Getty Images)

He said the project has been under review for about 20 years and that many other projects have gone through federal review while states worked through unresolved issues.

“We can still work in collaboration with the basin states while also preserving Utah’s water allotment,” he said in a statement.

Colorado River (credit: CBS)

The states are contending with a drier future as they renegotiate agreements that detail how Colorado River water is doled out.

The six-state letter reflects widespread fears that pulling more water from reservoirs could jeopardize the future of the already overtapped river and signals the possibility of court challenges jeopardizing new talks when drought contingency plans between the states expires in 2026.

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