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Bursting ice dam in Alaska highlights risks of glacial flooding around the globe

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Bursting ice dam in Alaska highlights risks of glacial flooding around the globe


Debris from a home that partially fell into the Mendenhall River sits on its banks in Juneau, Alaska, on Sunday Aug. 6, 2023. The city of Juneau says the Mendenhall River flooded on Saturday because of a major release from Suicide Basin above Alaska’s capital city, and at least two buildings were destroyed. (Mark Sabbatini/Juneau Empire via AP)

Mark Sabbatini/AP

JUNEAU, Alaska (AP) — The gray, two-story home with white trim toppled and slid, crashing into the river below as rushing waters carried off a bobbing chunk of its roof. Next door, a condo building teetered on the edge of the bank, its foundation already having fallen away as erosion undercut it.

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The destruction came over the weekend as a glacial dam burst in Alaska’s capital, swelling the levels of the Mendenhall River to an unprecedented degree. The bursting of such snow-and-ice dams is a phenomenon called a jökuhlaup, and while it’s relatively little-known in the U.S., researchers say such glacial floods could threaten about 15 million people around the world.

“We sat down there and were just watching it, and all of a sudden trees started to fall in,” Amanda Arra, whose house continued hanging precariously over the river bank Monday, told the Juneau Empire. “And that’s when I started to get concerned. Tree after tree after tree.”

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The flooding in Juneau came from a side basin of the awe-inspiring Mendenhall Glacier, which acts as a dam for the rain and melted snow that collect in the basin during the spring and summer. Eventually, the water gushed out from under the glacier and into Mendenhall Lake, from which it flowed down the Mendenhall River.

Water released from the basin has caused sporadic flooding since 2011. But typically, the water releases more slowly, over a number of days, said Eran Hood, a University of Alaska Southeast professor of environmental science.

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Saturday’s event was astonishing because the water gushed so quickly, raising the river’s flows to about 1 1/2 times the highest previously recorded — so much that it washed away sensors that researchers had placed to study the glacial outburst phenomenon.

“The flows were just way beyond what anything in the river could withstand,” Hood said.

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Two homes were completely lost and a third partially so, Robert Barr, Juneau’s deputy city manager, said Monday. There were no reports of injuries or fatalities.

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Eight buildings, including those that fell into the water, have been condemned, but some might be able to be salvaged by substantial repairs or bank stabilization, he said. Others suffered lesser damage.

While climate change is melting the Mendenhall and other glaciers around the world, its relationship to such floods is complicated, scientists say.

The basin where the rain and meltwater collect was formerly covered by the Suicide Glacier, which used to flow into the Mendenhall Glacier, contributing ice to it. But the Suicide Glacier has retreated as the climate warms, leaving a lake in the basin dammed by the Mendenhall.

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While that part can be linked to climate change, the unpredictable ways that those waters can burst through the ice dams and create floods downstream is not, they said.

“Climate change caused the phenomenon, but not the individual floods,” Hood said.

The variability in the timing and volume of such floods makes it hard to prepare for them, said Celeste Labedz, an environmental seismologist at the University of Calgary.

More than half of the people at risk from glacial outburst floods are in just four countries — India, Pakistan, Peru and China, according to a study published this year in Nature Communications.

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One of the more devastating such events killed up to 6,000 people in Peru in 1941. A 2020 glacial lake outburst flood in British Columbia, Canada, caused a surge of water about 330 feet (100 meters) high, but no one was hurt.

Because the ground along the Mendenhall River is largely made up of loose glacial deposits, it’s especially susceptible to erosion, Hood said. The damage could have been much worse if the flood coincided with heavy rains, he said.

Chris and Bob Winter built their house about 50 feet (15.2 meters) off the Mendenhall River in 1981. It flooded for the first time in 2014, an event that prompted them to raise their house 3 feet. It flooded again on Saturday with about 3 inches of standing water, enough to soak the carpets, subflooring and drywall.

“You just got to rip it all out,” Chris Winter said. “I just don’t know what’s going to happen, but we can’t live in our house right now.”

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She said her biggest concern is that they are both in their mid-70s and will probably have to move south at some point.

“We raised our family, and they’re gone and nobody’s in Juneau,” she said. “And I don’t know that we’ll be able to sell it.”

Thiessen reported from Anchorage. Associated Press writer Gene Johnson in Seattle and researcher Jennifer Farrar in New York contributed to this report.

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Alaska

State of Alaska will defend its right to facilitate oil and gas development

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State of Alaska will defend its right to facilitate oil and gas development


Last week, Superior Court Judge Andrew Guidi indicated he will rule that Alaska does not have authority to permit access across its lands to facilitate oil and gas development on the North Slope.

The Alaska Dept. of Natural Resources plans to fight and appeal any final adverse ruling that undermines the state’s constitutional interests in resource development.

The Department of Natural Resources has issued a permit allowing Oil Search Alaska (OSA) to cross the Kuparuk River Unit, operated by Conoco Phillips Alaska, to develop the Pikka Unit. As described in the State’s brief to the court, “the denial of such access implicates the delay of development of millions of barrels of oil and billions of dollars of public revenues.”

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“The State of Alaska has a constitutional obligation to maximize the development of our resources,” DNR Commissioner John Boyle said on Nov. 22. “We have to confirm with the Supreme Court that we have the authority to permit access for all developers to ensure we can meet this obligation.”

Once the Superior Court issues the final judgement, Alaska will be able to file its appeal. This is expected to occur in the coming weeks.

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Close encounters with the Juneau kind: Woman reports strange lights in Southeast Alaska skies

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Close encounters with the Juneau kind: Woman reports strange lights in Southeast Alaska skies


ANCHORAGE, Alaska (KTUU) – For Juneau resident Tamara Roberts, taking photos of the northern lights was just a hobby — that is until a different light altogether caught her eye.

Capturing what she’s called strange lights in the skies of Juneau near her home on Thunder Mountain, Roberts said she’s taken 30 to 40 different videos and photos of the lights since September 2021.

“Anytime I’m out, I’m pretty sure that I see something at least a couple times a week,” Roberts said. “I’m definitely not the only one that’s seeing them. And if people just pay more attention, they’ll notice that those aren’t stars and those aren’t satellites.”

Roberts has been a professional photographer for over 20 years. She said she changed interests from photographing people to wildlife and landscape when she moved to Juneau 13 years ago.

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Once she started making late-night runs trying to capture the northern lights, she said that’s when she started encountering her phenomenon.

Roberts said not every encounter takes place above Thunder Mountain: her most recent sighting happened near the Mendenhall Glacier while her stepmom was visiting from Arizona.

“She’d never been here before, so we got up and we drove up there, and lo and behold, there it was,” Roberts said. “I have some family that absolutely thinks it’s what it is, and I have some family that just doesn’t care.”

Roberts described another recent encounter near the glacier she said was a little too close for comfort. While driving up alone in search of the northern lights, she expected to see other fellow photographers out for the same reason as she normally does.

But this night was different.

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“I’ve gone up there a million times by myself, and this night, particularly, it was clear, it was cold and the [aurora] KP index was high … so as I’m driving up and there’s nobody there. And I was like, Okay, I’ll just wait and somebody will show up.’ So I backed up into the parking spot underneath the street light — the only light that’s really there on that side of the parking lot — and I turned all my lights off, left my car running, looked around, and there was that light right there, next to the mountain.”

Roberts said after roughly 10 minutes of filming the glowing light, still not seeing anyone else around, she started to get a strange feeling that maybe she should leave.

“I just got this terrible gut feeling,” Roberts said. “I started to pull out of my parking spot and my car sputtered. [It] scared me so bad that I just gunned the accelerator, but my headlights … started like flashing and getting all crazy.

“I had no headlights, none all the way home, no headlights.”

According to the Juneau Police Department, there haven’t been any reports of strange lights in the sky since Sept. 14, when police say a man was reportedly “yelling about UFOs in the downtown area.”

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Responding officers said they did not locate anything unusual, and no arrests were made following the man’s report.

The National Oceanic and Atmospheric Administration National Weather Service in Juneau also said within the last seven days, no reports of unusual activity in the skies had been reported. The Federal Aviation Administration in Juneau did not respond.

With more and more whistleblowers coming forward in Congressional hearings, Roberts said she thinks it’s only a matter of time before the truth is out there.

“Everybody stayed so quiet all these years for the fear of being mocked,” Roberts said. “Now that people are starting to come out, I think that people should just let the reality be what it is, and let the evidence speak for itself, because they’re here, and that’s all there is to it.”

See a spelling or grammar error? Report it to web@ktuu.com

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‘We’re ready to test ourselves’: UAA women’s hoops faces tallest task yet in another edition of the Great Alaska Shootout

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‘We’re ready to test ourselves’: UAA women’s hoops faces tallest task yet in another edition of the Great Alaska Shootout


ANCHORAGE, Alaska (KTUU) – Heading into Friday’s game with a 6-1 record, Alaska Anchorage women’s basketball is faced with a tall task.

The Seawolves are set to face Division I Troy in the opening round of the 2024 Great Alaska Shootout. Friday’s game is the first meeting between the two in program history.

“We’re gonna get after it, hopefully it goes in the hoop for us,” Seawolves head coach Ryan McCarthy said. “We’re gonna do what we do. We’re not going to change it just because it’s a shootout. We’re going to press these teams and we’re going to try to make them uncomfortable. We’re excited to test ourselves.”

Beginning the season 1-4, the Trojans have faced legitimate competition early. Troy has played two ranked opponents to open the season, including the 2023 national champion and current top-10 ranked Louisiana State University on Nov. 18. The Trojans finished runner-up in the Sun Belt Conference with a 15-3 record last season.

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“At the end of the day, they’re women’s basketball players too. They’re the same age as us and they might look bigger, faster and stronger, but we have some great athletes here,” junior guard Elaina Mack said. “We’re more disciplined, we know that we put in a lot of work, and we have just as good of a chance to win this thing as anybody else does.”

The 41st edition of the tournament is also set to feature Vermont and North Dakota State. The two Div. I squads will battle first ahead of UAA’s match Friday night.

All teams will also play Saturday in a winner and loser bracket to determine final results.

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