Colorado
Colorado River basin has lost nearly the equivalent of an underground Lake Mead
The Colorado River basin has lost 27.8m acre-feet of groundwater in the past 20 years, an amount of water nearly equivalent to the full capacity of Lake Mead, the largest reservoir in the United States, a new study has found.
The research findings, based on Nasa satellite imagery from across the south-west, highlight the scale of the ongoing water crisis in the region, as both groundwater and surface water are being severely depleted.
“Groundwater is disappearing 2.4 times faster than the surface water,” said Jay Famiglietti, a hydrologist at Arizona State University and the study’s senior author.
“Everyone in the US should be worried about it, because we grow a lot of food in the Colorado River basin, and that’s food that’s used all over the entire country,” he added. “These days, we’re also supporting a number of data centers and computer chip manufacturers, and these are essential to our economy.”
The Colorado River basin provides water to approximately 40 million people across seven US states, as well as to millions of acres of farmland. Most of the groundwater losses since 2003 occurred in the Lower Colorado River basin, including Arizona, Nevada and California, the study found.
The decreasing availability of surface water is easy to visualize across the west. There are the stark photographs of the dropping levels of water in Lake Powell and Lake Mead, and images of the Colorado River, whose flow has decreased approximately 20% in the past century.
But groundwater is different, Famiglietti said: “It’s invisible. It’s mysterious. The average citizen doesn’t really understand it.”
With less visibility has come less regulation: California only instituted statewide management of its groundwater in 2014, and before that, groundwater use was largely unregulated. Arizona, which has seen big groundwater decreases, still does not regulate groundwater usage in the majority of the state, Famiglietti said, which means that most property-owners can simply pump out as much groundwater as they want.
“Overpumping” is the main cause of groundwater losses over the past 20 years, he said. “There’s nothing illegal about it, it’s just unprotected.”
Most water across the west is used for agriculture, and as “large-scale industrial farming” has expanded in the south-west, and particularly in Arizona, so have the resources for farmers to dig deeper and bigger wells to extract groundwater, Famiglietti said. In Arizona, many of the new farms grow alfalfa, which is used as hay to feed cows. Data centers, though a much smaller overall factor than agriculture, also are a growing business that require water.
The new study found that the depletion of water storage in the Colorado River basin has sped up in the past decade. Since 2015, the basin has been losing freshwater at a rate three times faster than in the decade before, driven mostly by groundwater depletion in Arizona.
While the researchers are advocating for better management of groundwater supplies in the future, Famiglietti also said that the efficacy of groundwater regulations so far was still unclear.
The effects of the climate crisis, including rising average temperatures and more frequent and severe droughts, are expected to make the region’s water shortages worse in the future.
COLORADO SPRINGS, Colo. (KRDO) — Two weeks have passed since officials closed four blocks of Uintah Street to repair damage under a bridge over Shooks Run Creek, and we’re now learning specifics about the response.
Officials said that the city was the lead entity in the repair response, with Colorado Springs Utilities (CSU) providing a supporting role.
The closure began late in the afternoon of June 10 for what officials described as emergency bridge and utility repairs between Prospect and Institute streets, east of the Colorado College campus.
Officials said that on the previous day, a routine bridge inspection by the Colorado Department of Transportation (CDOT) discovered a large “void,” or sinkhole, under the bridge that compromised a utility line.
But officials didn’t explain how the void developed or how they repaired it until earlier this week, when Richard Mulledy, the city’s public works director, elaborated on the situation.
“It was about a six-foot by eight-foot void,” he explained. “That void was really caused by an abandoned storm sewer line and then a leaking manhole. It’s something that we see from time to time, but really doesn’t happen often.”
Crews approached the problem from under and above the bridge, with workers excavating into the street to access the utility lines.
“The utility line being compromised was an active storm sewer line,” Mulledy said. “It was sort of hanging out in the open and was unsecured. The old storm sewer line had been abandoned for decades and was starting to fail.”
Crews removed the old stormwater pipe, repaired the manhole, and backfilled the void with a material called “flow.”
“Flow fills almost like a kind of liquid concrete,” Mulledy detailed. “And that’s a really great structural solution. So, we filled that entire thing up, made sure the void is closed, and made sure it’s structurally sound.”
He added that the bridge is around a century old, the same age as most bridges across the creek.
“This was identified and got fixed in 48 hours, rather than let something structural fail, and then we’d be in a big, giant construction project,” Mulledy said. “The structure itself, I don’t think, was ever really threatened.”
The closure ended on Saturday, June 13.
A Colorado man died on Tuesday when a boulder fell on him and crushed him. That’s according to the Chaffee County Sheriff’s Office, who identified the man as 59-year-old Paul Frasch.
Frasch is a resident of Silverthorne. The sheriff’s office says he was walking in an area along the Arkansas River in Buena Vista in the middle of the day with his coworker when rocks fell and hit him.
According to investigators, the boulder that landed on Frasch weighed at least 1,000 pounds.
The coworker received injuries to his arms after trying to help Frasch.
When first responders got to the scene, the boulder was still on top of Frasch. He was declared dead at the scene.
The Longmont City Council voted unanimously Tuesday night to decline a request from the town of Superior to support its appeal to the Colorado Supreme Court in a long-running lawsuit over aircraft noise from Rocky Mountain Metropolitan Airport.
The decision comes about a week after the council met in a closed-door executive session to receive legal advice regarding Superior’s request that Longmont join an amicus brief supporting the appeal.
Councilmember Jake Marsing moved to adopt the city’s proposed response to Superior, and the motion passed 7-0 after a brief discussion.
Superior is seeking Colorado Supreme Court review of a Colorado Court of Appeals decision that found federal law prevents courts from ordering Rocky Mountain Metropolitan Airport to restrict aircraft operations because regulation of air traffic falls under the authority of the Federal Aviation Administration.
Superior and Boulder County sued the Jefferson County-owned airport in 2024, arguing that training flights create excessive noise and lead emissions for nearby communities. While a district court dismissed the lawsuit in 2025, the Court of Appeals this year revived part of the lead contamination claim while upholding the dismissal of the noise-related claims.
In the statement adopted Tuesday, Longmont acknowledged it has also heard complaints from residents about airplane noise and said the city takes those concerns seriously. However, the statement said, Longmont’s position differs from neighboring communities because it owns and operates Vance Brand Airport.
“The city believes that local control over airport operations is important and these rights should not be taken by the courts,” the adopted statement reads. The city also said it is continuing efforts to address noise concerns through voluntary measures, including updates to its voluntary noise abatement procedures and a voluntary saturated pattern policy that limits the number of aircraft in the traffic pattern.
Mayor Susie Hidalgo-Fahring also noted the city is continuing discussions about its long-term vision for airport operations.
The statement leaves the door open for future collaboration with regional partners and the FAA but concludes that Longmont will not file an amicus brief with the Colorado Supreme Court at this time.
Before the vote, Councilmember Matthew Popkin asked City Attorney Eugene Mei to clarify for residents who, exactly, had provided legal advice to the council during the executive session. Mei said Longmont’s outside aviation counsel did not advise the city because that firm is representing Jefferson County in the appeal and therefore has a conflict of interest. Instead, the council received advice solely from the city’s legal staff.
Longmont’s decision contrasts with those of neighboring Lafayette and Louisville, whose city councils have approved joining an amicus brief supporting Superior’s petition. Broomfield has also indicated support for the effort.
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