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Springtime Rain Crucial for Getting Wintertime Snowmelt to the Colorado River, Study Finds – Inside Climate News

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Springtime Rain Crucial for Getting Wintertime Snowmelt to the Colorado River, Study Finds – Inside Climate News


The Never Summer Mountains tower almost 13,000 feet above sea level on the west side of Rocky Mountain National Park, the regal headwaters of the Colorado River. Snowmelt and rainfall trickle southwest from the peaks through jumbles of scree and colorful deposits of silicic rock, formed some 27 to 29 million years ago, then plunge into Gore Canyon. There, the river gallops downstream, absorbing other tributaries from Arizona, New Mexico, Utah and Wyoming on its way to California. More than 40 million people from seven states and Mexico depend on water from the Colorado River Basin to drink, irrigate crops, generate electricity and recreate, a demand that is greater than the river system can bear. 

Historically, variations in snowpack would correlate with the amount of available water in the river come summertime. But since 2000, less and less snowmelt has been making its way into the Colorado River, and water levels in the river have not tracked as closely with variations in precipitation. A new study from the University of Washington, published today in the journal Geophysical Research Letters, offers a clue as to why this may be: increased evaporation and decreased springtime rainfall is leading parched plants and trees to suck up much of the snow melt before it ever reaches the river. 

“These headwater areas provide around 70 to 80 percent of the Colorado River’s water,” said Daniel Hogan, a PhD student at the University of Washington who worked on the study. “Snowy peaks and all those high mountain rivers are really the linchpin of the system. So if less water is coming from there, then you can expect less water in the entire river.”

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Hogan and a team of scientists used precipitation and streamflow data from 26 upper Colorado River basins—a large sample of the eventual river’s supply, accounting for about a quarter of the Colorado River’s streamflow—to study why there was a growing disparity between snowpack and water levels. 

They found that the upper Colorado River basin had experienced a 9 percent decrease in annual spring rainfall compared with precipitation levels prior to 2000. Over half of the 26 basins they surveyed had “significant annual precipitation decreases,” they wrote. Spring had the most severe dropoff in rain, with a 14 percent decline compared to pre-2000 data. “Lower and middle elevation headwater basins were particularly affected,” with 12 of 17 showing “significant decreases,” they wrote.

This drop-off in spring precipitation appears to be especially detrimental to water levels in the summer. Though the researchers did find evidence of decreased rainfall in other seasons, spring rains accounted for 56 percent of the water-level variance.

“Spring precipitation decreases alone fall short of explaining observed streamflow deficits,” the team concluded, but when combined with other forms of water loss, like evaporation and nearby vegetation soaking up the moisture, that explained 67 percent of the variance.

Among the tens of millions of people the Colorado River is overpromised to are farmers irrigating about 5 million acres of agricultural land. But theirs aren’t the only plants impacting Colorado River levels. In their study, the research team worked under the assumption that trees and vegetation in forests ringing the Rockies need springtime precipitation to grow; in its absence, snowmelt becomes the plants’ primary source of water—and they have first dibs. 

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“It’s a very sound study,” said Tanya Petach, a climate science fellow with the Aspen Global Institute, which helps connect academics with outside organizations that can make use of their work. Petach, who was not involved in the University of Washington study, is a hydrologist who got her Ph.D. in environmental engineering from the University of Colorado. “It helps fill out part of the missing puzzle piece” as to why high levels of winter snowpack haven’t translated to large stream flow numbers in some recent years, she said.

The group’s findings read “like two knockout punches,” said Hogan. “You have less precipitation, so that leads to less streamflow, just inherently. And then, you also have a consequence of the trees and plants that still need their water,” which leads to “uncertainty in how much water we think we have.” He hopes this study helps water modelers understand the importance of using spring precipitation in addition to winter snowpack to predict how much water will be available in the river. 

This study “puts a lot of momentum” behind improving spring forecasts for Colorado River stream flows, Petach said. 

Hogan could not say for sure whether climate change has played a role in the decreasing springtime precipitation levels across the upper Colorado River basin as no part of their study was designed to investigate that possible connection. But other studies have already suggested climate change is driving droughts in the Colorado River’s upper basin. 

Decreasing water levels across the Colorado River “could very well be linked to climate change directly,” Hogan said. “And if that is the case, then we can expect these declines to continue.”

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Colorado River states have just weeks to strike a deal. Here’s why it’s so hard for them to agree.

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Colorado River states have just weeks to strike a deal. Here’s why it’s so hard for them to agree.


Each negotiator drew a card from the deck.

John Entsminger, from Nevada, picked the highest card: the ace. Gene Shawcroft, from Utah drew the lowest: an eight.

“My luck in Las Vegas isn’t very good,” Shawcroft said, holding up his card to show an audience of 1,700 people. They chuckled under the ornate chandeliers of a Caesars Palace ballroom.

Shawcroft, Entsminger and the five other negotiators from the states in the Colorado River Basin were picking cards to determine the speaking order for the final panel of the Colorado River Water Users Association conference in Las Vegas in mid-December.

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While the stakes for that card draw were quite low, the stakes of what the seven states are negotiating couldn’t be much higher.

(Brooke Larsen | The Salt Lake Tribune) Gene Shawcroft, Utah’s Colorado River commissioner, speaks on a panel of state negotiators at the Colorado River Water Users conference in Las Vegas on Thursday, Dec. 18, 2025. Negotiators picked from a deck of cards to determine the speaking order. Shawcroft chose the lowest card, so he went first.

The Colorado River is the lifeblood of the American Southwest and northern Mexico. Cities, tribes, farms, fish and various industries rely on it for drinking water, irrigation, habitat, power and more.

But it has been overtapped. And as the region gets hotter and drier and populations continue to boom, there is less and less water to go around.

The states have struggled to agree on how to share the river. Politics, different experiences of the river, complicated regulations and dwindling water supplies make negotiations difficult.

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On the last day of the conference, state negotiators tried to appear cordial and close to consensus, even making light of the tension.

“It’s an honor and pleasure to be here today alongside my Colorado River family,” Becky Mitchell, Colorado’s negotiator, said. “As you all know, sometimes you can’t pick your family, but you get through it anyways.” The audience roared in laughter.

Differences quickly surfaced, though, and states didn’t appear close to reaching a deal.

The clock is ticking: The seven basin states only have until February 14 to come up with a plan for how to manage the river in dry times. The current guidelines expire at the end of the year. If they test their luck and fail to reach an agreement, they risk the Interior Department making a plan for them or years of litigation.

The seven state negotiators are meeting for four days in Salt Lake City this week as they work to hash out a deal before that deadline, according to Becki Bryant, public affairs officer with the Bureau of Reclamation.

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The bureau released a draft environmental impact statement on Friday that lays out a series of pathways to manage the river system and its major reservoirs. If the states reach a deal, the bureau says it will insert that plan as the preferred way forward, Scott Cameron, acting commissioner for the bureau, told The Tribune at the conference. If states can’t agree, the federal government will choose an alternative itself, he added.

(Brooke Larsen | The Salt Lake Tribune) Scott Cameron, acting commissioner of the Bureau of Reclamation, addresses a large audience at the Colorado River Water Users Association conference in Las Vegas on Wednesday, Dec. 17, 2025. He emphasized the urgent need for states to reach a deal on the future management of the river.

In this game of water diplomacy, there will likely be no clear winners. “No one is too big to fail,” said Becky Mitchell, Colorado’s negotiator.

Federal officials say sacrifices must be made going forward.

“That means being willing to make and adhere to uncomfortable compromises,” Cameron said.

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Whether states are willing to give enough to seal a deal is yet to be seen.

Is hydrology the problem?

Throughout the conference, anxiety about drought and the abnormally warm start to winter hung over panel discussions and side conversations in hallways lined with velvet curtains colored terracotta, like the Colorado River after a big storm.

October brought heavy rains, but November and December were abnormally warm and dry. Snowpack in the Upper Colorado River Basin is at its lowest level in a quarter century, according to the Colorado Basin River Forecast Center.

Lake Powell is only 28% full and could drop below 3,490 feet next year, according to forecasts from the Bureau of Reclamation. At that level, water would be unable to pass through Glen Canyon Dam’s electricity-generating turbines.

(Christopher Cherrington | The Salt Lake Tribune)

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The drought has been blamed for the stagnation in the negotiations. “We need to remember that hydrology is the problem,” Brandon Gebhart, Wyoming’s negotiator, said. “It’s not political positions. It’s not legal interpretations. It’s not one state.”

Low reservoirs mean less water storage to prop up the river system when flows are low.

“Without that resiliency, people are very risk averse, very concerned about every acre-foot, so the give and take becomes very difficult,” Chuck Cullom, director of the Upper Colorado River Commission and former Colorado River programs manager in Arizona, told The Tribune.

When the seven states established guidelines for how to manage the river during dry years in 2007, drought had begun to plague the basin. But there was a much greater storage buffer then.

“The 2007 guidelines started with Lake Powell and Lake Mead, the two largest reservoirs in the United States, at about 90% capacity,” Cullom said. Today, the combined contents of Powell and Mead is closer to 30% full, he added.

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Even with additional deals in 2019 and 2023 that led to sharp reductions in water use in the Lower Basin, the water crisis has continued to worsen, and climate scientists have said that trend will continue.

“We haven’t really got much of a break hydrologically, but this is something that has been foreseeable for a very long time,” Sarah Porter, director of the Kyl Center for Water Policy at Arizona State University, told The Tribune in November.

(Bethany Baker | The Salt Lake Tribune) The bathtub ring is visible at Lake Powell near Ticaboo, Utah on Tuesday, Oct. 17, 2023.

Some at the conference argued leaders need to stop blaming the stalemate on the river’s flow.

“Water is life, and like all of nature, the river is inherently chaotic,” Kirin Vicenti, water commissioner for the Jicarilla Apache Nation, said. “Despite those that think hydrology is the problem, it’s not, and it can’t always be the scapegoat. Our planning and policies must allow for flexibility and innovative and dynamic solutions.”

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A ‘very technical’ disagreement

The basin states are working to come to terms that will provide more flexibility in river management during dry years.

The Upper Basin states — Utah, Colorado, New Mexico and Wyoming — have been at odds with the Lower Basin — Arizona, California and Nevada — over how to divvy up and enforce water cuts, though.

That’s in part due to different interpretations of the Upper Basin states’ obligation to the Lower Basin under the Colorado River Compact established over a century ago.

“This is a very technical, nerdy, hydrological disagreement,” Porter told The Tribune after the conference.

If a rolling average of 7.5 million acre-feet of water doesn’t make it past Lee’s Ferry, just below Glen Canyon Dam, over a ten year period, Lower Basin states may sue the Upper Basin.

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(Trent Nelson | The Salt Lake Tribune) Glen Canyon Dam in Page, Ariz., on Monday, May 19, 2025.

State negotiators want to avoid litigation and may include protections against that in their deal. But so far, states have not found enough common ground.

Tom Buschatzke, Arizona’s negotiator said he needs the Upper Basin to make conservation commitments that are “verifiable and mandatory.” To sign on to a deal, Buschatzke has to get a deal approved by his state legislature, an “additional burden” unique to Arizona, Porter said.

The Upper Basin negotiators said demands for mandatory cuts from their water users ignores the realities of how water is managed and flows through their states.

‘Different experience of the river’

Across much of Utah, Colorado River water is often known by a different name locally: Ashley Creek, Price River, Escalante River, Rock Creek. Dozens of smaller waterways flow through the mountains and canyons of Utah to major tributaries like the Green and San Juan Rivers, before dumping into the Colorado in the southeast corner of the state.

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The flow in those lesser creeks and rivers fluctuate day to day, year to year, based on snowpack, creating a variable water supply across Utah and other Upper Basin states.

Some reservoirs, such as Strawberry and Scofield, exist along the journey to store water for drinking water and irrigation. But those human-made lakes pale in comparison to the nation’s largest reservoir, Lake Mead, that the Lower Basin relies on for water delivery.

“That very different experience of the river and water supply makes it hard for people to find common ground because there’s not a lot of common experience,” Cullom said.

(Rick Egan | The Salt Lake Tribune) The San Juan River, a tributary of the Colorado River, near Mexican Hat, on Friday, May 27, 2022.

Beyond just differences in storage and water availability, the Secretary of the Interior has much greater powers in the Lower Basin thanks to a 1964 Supreme Court ruling that deemed the secretary the “water master” of the river below Lake Mead.

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“The secretary could go to water users in the Lower Basin and say, ‘There’s an existential crisis. I’m going to cut you off.’ The secretary does not have that authority in the Upper Basin,” Cullom said.

‘We’re all on the same rowboat’

Entsminger, the Nevada negotiator, spoke last on the final panel at the Colorado River Water Users Association conference — a reward for drawing the ace.

He kept it short and pointed at his fellow negotiators.

“If you distill down what my six partners just said, I believe there’s three common things: Here’s all the great things my state has done. Here’s how hard, slash impossible, it is to do any more. And here are all the reasons why other people should have to do more,” he said. “As long as we keep polishing those arguments and repeating them to each other, we are going nowhere.”

Entsminger closed his speech, and the largest Colorado River conference of the year, with a metaphorical warning for any negotiator that holds a hard line.

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“We’re all on the same rowboat,” he said. “The first one to fire a shot puts a hole in the boat and sinks it.”

(Trent Nelson | The Salt Lake Tribune) A raft on the Colorado River as seen from Navajo Bridge in Ariz. on Tuesday, May 20, 2025.

This article is published through the Colorado River Collaborative, a solutions journalism initiative supported by the Janet Quinney Lawson Institute for Land, Water, and Air at Utah State University. See all of our stories about how Utahns are impacted by the Colorado River at greatsaltlakenews.org/coloradoriver.



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Small plane pilot injured in northwest Colorado crash after suspected engine failure

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Small plane pilot injured in northwest Colorado crash after suspected engine failure


The pilot of a small plane that crashed Sunday in Eagle County walked away with minor injuries, according to the sheriff’s office.

Investigators believe the plane’s engine failed midflight, causing it to clip a tree and crash near Dotsero, in the 1200 block of Sweetwater Road, according to a news release from the Eagle County Sheriff’s Office.

Dotsero is roughly 18 miles northeast of Glenwood Springs and 43 miles west of Vail.

Vail Public Safety Communications was notified about the incident by a Garmin alert shortly after 2 p.m. Sunday, the release stated. Shortly after, someone called to report the plane crash.

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Eagle County deputies responded to the crash site and found a 48-year-old man with a minor cut. He was the plane’s pilot, sheriff’s officials said.

The nearby plane had crashed onto its nose with its tail in the air, photos from the sheriff’s office show.



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Bennett Zmolek’s first goal in four years sparks UND past Colorado College

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Bennett Zmolek’s first goal in four years sparks UND past Colorado College


COLORADO SPRINGS, Colo. — There was no elaborate celebration from Bennett Zmolek.

In fact, he didn’t even see it go in.

“I saw Resch coming at me,” Zmolek said of teammate Cole Reschny. “I was like, I guess it went in.”

Zmolek scored his first goal in nearly four years to help UND beat Colorado College 5-2 on Saturday night in Ed Robson Arena.

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His last goal was Jan. 20, 2022, when he was a freshman at Minnesota State against St. Thomas. That was 1,450 days and three hip surgeries ago.

With the game tied 1-1 in the second period, Zmolek spotted open ice on the right side of the rink and pinched from his defensive spot. Reschny made a cross-ice pass and Zmolek one-timed it five-hole on Tiger goalie Kaidan Mbereko.

“I’d say huge props to Resch,” Zmolek said. “He set it all up. I just had to tap it in.”

Teammate Dylan James grabbed the puck for Zmolek to keep.

“So proud of him,” James said. “Obviously, he’s been through a lot these past couple years. He’s played minimal games the last two years and he was voted captain. That shows what kind of guy he is. He’s the rock of our team. It’s very special seeing him get his first in a UND jersey.”

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Zmolek’s teammates celebrated the goal more than he did.

“We were all screaming on the bench,” forward Anthony Menghini said. “He’s such a great leader, such a great captain, does all the right things. For him to put it in the net was huge.”

UND defenseman Bennett Zmolek (center) celebrates his goal against Colorado College with forward Cole Reschny (17) on Jan. 10, 2026, in Ed Robson Arena.

Daryl Batt / Colorado College athletics

UND also received goals from James, Tyler Young, Abram Wiebe and Reschny. James and Reschny tallied assists and had two-point nights, while Menghini notched two assists.

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UND (17-5) took four points from the weekend after losing Friday’s series opener 3-2 in overtime.

The Fighting Hawks finally got to Tiger goalie Kaidan Mbereko, who had won six in a row against UND. Mbereko gave up four goals on 24 shots before leaving with an apparent injury in the third period.

“I don’t believe our record is great against CC, but this team is different,” James said. “It feels great to bounce back from yesterday and get a win.”

The Fighting Hawks sit atop the National Collegiate Hockey Conference standings, five points ahead of Denver. The Pioneers come to Ralph Engelstad Arena next weekend.

“Their coach. . . I have a lot of respect for Kris Mayotte,” UND coach Dane Jackson said. “He kind of mentioned that he really thought our North Dakota mentality was evident this weekend. That was pretty nice for him to say.”

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Jan Špunar, starting on consecutive nights for the first time since Dec. 5-6 at St. Cloud State, stopped 19 of 21. He allowed a pair of goals to defenseman Mats Lindgren, a midseason pickup from the ECHL.

But the night belonged to Zmolek.

After the game, Zmolek was asked what he remembered about his last goal.

“St. Thomas, right?” he said. “Their old barn. Low blocker.”

That goal came at the end of the 2021-22 season. Zmolek missed nearly the entire 2022-23 season due to hip surgery.

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He transferred to UND in the summer of 2023, and helped anchor UND’s defensive corps to a Penrose Cup in 2023-24. He missed all but one game last year with another hip surgery.

“I’m so happy for him,” Jackson said. “It was a great read, a great pass and he got a lot of wood on it. It was really a high-skill play. The guys are so happy for him. He’s such a leader for us in so many ways. Obviously, most of the time it’s with his defensive play and penalty killing and everything else. But to see him bring out the offense in a big moment, I was just so happy for him. He’s a warrior.”

Notes: UND wore its black jerseys. It is 4-1 in the black jerseys this season. Colorado College wore gold. . . UND played without Josh Zakreski (lower body) and Cody Croal (illness). The Fighting Hawks moved Jayden Jubenvill into the lineup for Sam Laurila. . . Colorado College played without forward Owen Beckner (upper), forward Brandon Lisowsky (lower), defenseman Max Burkholder (lower) and defenseman Colton Roberts (upper).

Brad Elliott Schlossman
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Brad Elliott Schlossman

Schlossman has covered college hockey for the Grand Forks Herald since 2005. He has been recognized by the Associated Press Sports Editors as the top beat writer for the Herald’s circulation division four times and the North Dakota sportswriter of the year twice. He resides in Grand Forks. Reach him at bschlossman@gfherald.com.

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