Juneau’s 2026 glacial outburst flood

Update 8:47 p.m. Thursday

At a press conference Thursday evening, Chalyee Éesh Richard Peterson, president of the Central Council of the Tlingit & Haida Indian Tribes of Alaska, called the glacial outburst flood event “anticlimactic.” 

“I think we’re experiencing a collective sigh of relief in Juneau, and especially those in the area impacted,” Peterson said. “I think the message that we’re digesting is that preparedness works.”

Nicole Ferrin, the warning coordination meteorologist at the National Weather Service in Juneau, said the event will soon be officially over.

“Water levels are falling about a foot per hour, so residents can expect our flood warning to be canceled sometime this evening once water levels fall below minor flood stage,” Ferrin said.

Read the story here. 

Watch the full press conference below. 

Update 6:36 p.m. Thursday 

The 2026 Juneau Glacial Lake Outburst Flood Joint Information Center will hold a press briefing at 7:15 p.m. at the Juneau Police Department at 6255 Alaway Ave. Tune in above, or listen on KTOO 104.3 FM and 91.7 FM.

Update 6 p.m. Thursday

Flood stage: Moderate
Lake level: 11.49 feet and falling as of 5:30 p.m.

The City and Borough of Juneau announced at 5 p.m. that the flood threat has ended. The city reopened evacuated areas for residents only.

Officials advise people to avoid riverbanks, as well as driving through standing water.

The flood crested at 14.7 feet around 2:15 p.m. today, which is lower and earlier than previously predicted. The lake level is at 11.49 feet and falling as of 5:30 p.m. 

City facilities that were previously closed will reopen during regular hours tomorrow, except for the Mendenhall Valley Public Library.

Brotherhood Bridge is now open to pedestrians again, but the paths that go beneath the bridge are still closed until further notice.

Back Loop Bridge will remain closed until Alaska Department of Transportation officials can assess its safety.

Update 3:19 p.m. Thursday

The glacier lake outburst flood has officially crested at 14.7 feet at 2:15 p.m., according to the National Weather Service.

“According to the data that we have coming straight into our system, we have reached a crest of 14.7 feet, and we are now on our descent,” said Zoe Kaplan, a meteorologist with the weather service in Juneau, during a livestream just before 3 p.m.

The flood is still at major flood stage.

“The flooding effects will not go away immediately,” Kaplan said. “We still have to come down from ‘major’ flood stage into ‘moderate,’ and then continue down from there. But, the river will fall faster than it came up.”

As of 2:45 p.m. the lake level was at 14.44 ft. and falling.

“We did it, Juneau,” Kaplan said toward the end of the livestream.

Update 2:55 p.m. Thursday

Flood stage: Major
Lake level: 14.61 ft as of 2:30 p.m. (down from 14.70 ft.)

The National Weather Service is about to provide a live update. Watch here above.

Update 1:55 p.m. Thursday 

Flood stage: Major
Lake level: 14.58 feet as of 1:30 p.m.

Crest timing: 3 p.m. to 4 p.m. Thursday
Crest height: 14.8 ft

The latest estimates from the National Weather Service is showing the crest of the glacial outburst flood will be 14.8 ft, which is lower than previous forecasts of 15.8 to 16.3 ft. The service also updated a more specific time window from 2-6 p.m. to 3-4 p.m.

Brotherhood Bridge was closed on the north side to pedestrians, while open on the south side where walkers and bikers came by to check out the Mendenhall River as it neared major flood levels at 12:15pm on Aug 13, 2026. (Photo by Corinne Smith/Alaska Beacon and KTOO)

Update 1:39 p.m. Thursday

An Alaska Seaplanes de Havilland Beaver made an emergency landing at the mouth of Mendenhall River in Juneau Thursday morning, according to the company’s Facebook. No Injuries were reported.

The plane made the emergency landing on the river around 11:17 a.m. immediately after takeoff from the floatplane pond at Juneau International Airport. There was one pilot and no passengers on board.

The pilot was with Alaska Seaplanes personnel as of 12:39 p.m., The company is actively working to recover the plane from the Mendenhall River.

The aircraft landed safely but subsequently drifted into a root ball floating in the rising river.

Read the full story here. 

An Alaska Seaplanes de Havilland Beaver in the Mendenhall River amid the glacial outburst flood. (Photo by John Fortin)

Update 12:45 p.m. Thurday

Flood stage: Major
Lake level: 14.23 feet as of 12:15 p.m.

Crest timing: 2 p.m. to 6 p.m. Thursday
Crest height: 15.8 to 16.3 ft


CBJ has received reports from residents seeing small amounts of water on the dry side of the flood barrier system, according to a social media post. 

“Seepage was anticipated. Our teams are constantly monitoring the barriers and are on scene,” the post says. 

(Photo from City and Borough of Juneau Facebook page)

The city asks residents who see water in their area to call the Flood Hotline at 907-500-0890. The information will go straight to emergency response teams.

People are encouraged to stay away from the HESCO barriers.

Update 12:28 p.m. Thursday

As floodwaters in Juneau rise slower than initially predicted, some Mendenhall Valley residents who live next to the river said they’re feeling hopeful about a lower crest and less damage. Last year, nearly 50 homes flooded since the HESCO barriers leaked. In 2024, before the barriers were built, nearly 300 homes flooded. 

Thursday morning, residents sipped coffee in the sun on porches and driveways. By 10:20 a.m., water hadn’t touched the barriers yet along Marion Drive and Meander Way. 

Sam Hatch lives on Meander Way, a street that’s seen disastrous flooding in past years. Last year, water leaked through the HESCO flood wall and inundated some crawl spaces and garages on the street. 

But the Hatch family home was spared. 

In 2024, they raised their house on steel pilings drilled 30 feet into the ground to protect themselves from the annual flood. 

While Hatch’s kids camped out in a friend’s yard outside of the evacuation zone Wednesday night, he and his wife slept in their own bed.

“I just left the window open, expecting if the pumps go on, that wakes you up, and then you know to pay attention or do stuff — and nothing happened,” Hatch said.  

Read the rest of this story here.

The Zaleski’s home lined with sandbags and water bladders on Thursday, Aug. 13, 2026. (Photo by Clarise Larson/KTOO)

Update 12 p.m. Thursday

The glacial outburst flood is now at major flood stage, as of 11:30 a.m. The lake level is at 14 feet and rising. 

The National Weather Service in Juneau is forecasting the flood will crest between 2 p.m. and 6 p.m. today, with the peak water level between 15.8 and 16.3 feet, which is later and a few inches lower than previously predicted.

Update 11:07 a.m. Thursday

Fifteen residents stayed overnight at an emergency shelter set up at the former Floyd Dryden Middle School hosted by the American Red Cross, according to officials Thursday morning. Several more camped outside in tents, having evacuated from the Mendenhall Campground. 

Two dogs and one cat stayed in the pet shelter area, staffed by volunteers with Grateful Dogs of Juneau. Meals were provided by the Salvation Army, and snacks and a few games were set up as residents prepared to wait out the flood on Thursday.

Bethany Remi Onibokun stayed overnight with her son and mother. They evacuated their home on Susan Way, about two blocks from the lower Mendenhall River. She said their home was newly included in the evacuation advisory zone this year, which prompted them to evacuate. 

“We just followed the guidelines. We talked to the hotline people” Remi Onibokun said. “And we’re like ‘OK,  we’re just going to come to the shelter.’ It’s not a bad place to be.”

She said she expected more people to evacuate. 

“I am surprised there aren’t more people staying at the shelter who didn’t evacuate to any of the churches, or the shelters that are available. Because of the damage and the risk last year, I feel like it might be a false sense of security.” Remi Onibokun said.

Remi Onibokun is a student at University of Alaska Southeast. She said she’s planning to wait out the flood Thursday and start on schoolwork as she prepares for classes to begin next week. 

She hopes her home doesn’t flood. 

“It’s everything I’ve got,” she said. “It’s kind of scary if you think about it, the flood waters coming up, and just destroying property like that.”

The shelter at Floyd Dryden will be open as long as the evacuation advisory is in effect.

The emergency shelter hosted by the American Red Cross also had a place for pets, which included two dogs and one cat overnight during the glacial flood outburst event, according to officials on Aug 13, 2026. (Photo by Corinne Smith/Alaska Beacon and KTOO)

Update 10:15 a.m. Thursday

Juneau’s glacial lake outburst flood will crest later and a few inches lower than previously predicted, according to the National Weather Service. At a briefing Thursday morning, officials said they now expect the flood to reach its maximum height of 15.8 and up to 16.3 between 2 p.m. and 6 p.m. this afternoon.

City and Borough of Juneau Emergency Programs Manager Ryan O’Shaughnessy says emergency managers are still urging residents to evacuate the flood zone. A break in the sand-filled HESCO barriers could inundate homes in mere minutes, leaving no time to escape.

“We are starting to see trees and other debris move down the river, and that remains one of the highest failure modes for the HESCO system,” O’Shaughnessy said. “A flash flood still could happen at any time, and we really encourage everyone to evacuate.”

For now, O’Shaughnessy says crews have noticed “ponding” in some areas but have not needed to use pumps to alleviate flooding.

O’Shaughnessy says people who live outside the flood zone should also stay away from the Mendenhall River. He says emergency managers have received some reports of what’s known as “disaster tourism.”

“That looks like people being on Brotherhood Bridge, going to Back Loop Bridge, and driving through the neighborhood while there’s an evacuation advisory, while there’s water behind these barriers, and while your neighbors are preparing for this flood,” he said. “I’d like to really encourage everyone to be a good neighbor. Please leave the evacuation area if you live there, and please don’t go there if you don’t live there.”

National Weather Service forecasters expect the river to enter the major flood stage within the next hour. The river is currently at 13.2 feet and rising as of 9:30 a.m.

Update 9:15 a.m. Thursday

The 2026 Juneau Glacial Lake Outburst Flood Joint Information Center will hold a press briefing at 9:15 a.m. Tune in above.

Presenters include:

  • City and Borough of Juneau
  • National Weather Service
  • 2026 Juneau GLOF Unified Command
  • Alaska Department of Transportation & Public Facilities, Southcoast Region

The agenda includes a short briefing from the National Weather Service, an overview of agency response and preparedness actions to the Glacial Lake Outburst Flood and more about what residents can expect from coordinating agencies as the river begins to rise.

The Mendenhall Lake is now in a “moderate” flood stage. The river level is at over 12.8 feet and rising as of 9 a.m. The next flood stage is “major” at 14 feet.

Update 8:15 a.m. Thursday

The Mendenhall Lake is now in a “moderate” flood stage. The river level is at over 12.4 feet and rising as of 8 a.m. The next flood stage is “major” at 14 feet and is expected around 9:15 a.m.

The National Weather Service in Juneau is forecasting the flood will crest between 11 a.m. and 3 p.m. Thursday with the peak water level between 16.1 and 16.6 feet – nearly as high as last year’s record. 

Alaska Electric Light and Power, or AEL&P, will also consider cutting power to potentially flooded areas at major flood stage, or roughly 9 a.m., starting with the View Drive area. That’s according to a social media update from the City and Borough of Juneau Thursday morning. 

Additional areas of Mendenhall Valley will be considered for power disconnects closer to the 16-foot flood stage, around the same time as the peak. 

Areas that could face power service disruptions during flooding shared on Facebook. (via City and Borough of Juneau)

CBJ warned power disconnects may follow with little to no notice and advised residents without power to minimize water use at these times as well. 

AEL&P will post outage alerts at facebook.com/AELPJuneau.

Update 2:29 a.m. Thursday

The National Weather Service in Juneau is now forecasting the flood will crest between 11 a.m. and 3 p.m. on Thursday, still between 16.1 and 16.6 feet. That’s according to a 1:30 a.m. update.

“We’re in a much better area to fine tune the forecast,” said Andy Park with the National Weather Service in Juneau. “We’ve had a slower rate of rise, and we’re able to dig into the data and get a more accurate crest.”

The flood level is at 10.25 feet and rising as of 2:00 a.m. It is currently a moderate flood and is expected to reach a major flood at around 8:45 a.m. on Thursday.

The City and Borough of Juneau closed the Brotherhood Bridge sidewalks at 11:00 p.m. Wednesday in response to the flood. The bridge remains open to vehicle traffic, but is located in the evacuation area. The city recommends drivers to avoid travel in the area and not to stop if crossing the bridge.

The pedestrian paths will reopen once flood levels drop below 10 feet and crews determine it is safe.

Road condition updates will be posted on 511.alaska.gov.

Correction: This update previously misstated the forecasted time for the major flood stage.

Update 9:35 p.m. Wednesday

Gov. Dunleavy has issued a State Disaster Declaration for Juneau in response to the impending glacial lake outburst flood originating from Suicide Basin, according to a state press release.

The City and Borough of Juneau and the Central Council of the Tlingit & Haida Indian Tribes of Alaska submitted the request for immediate assistance from the state earlier today. 

Prior glacial lake outburst floods have triggered state and federal disaster recovery responses in both 2023 and 2024. In 2025, the State of Alaska issued a preemptive disaster declaration when an outburst became imminent. 

This latest declaration activates the State of Alaska Public Assistance disaster recovery program. The declaration also allows the state to temporarily waive certain administrative regulations that could slow down prevention or mitigation efforts, such as clearing waterway debris that threatens flood-control barriers.

The State Emergency Operations Center will support local and tribal management efforts, like facilitating interagency coordination, streamlining emergency permits, managing public communications, and positioning response assets. The state operations center will deploy three emergency management personnel to Juneau to monitor conditions on the ground during the flooding.

HESCO barriers installed along the Mendenhall River on Wednesday, Aug. 12, 2026. (Photo by Clarise Larson/KTOO)

Update 9 p.m. Wednesday

The Back Loop Bridge is officially closed to vehicle and pedestrian traffic, as of 8:30 p.m.

Mendenhall Loop Road is closed to through traffic between Montana Creek Road and Mint Way. Access remains open to River Road and View Drive for local traffic.

Unified Command asks the public to “please respect the closure. Do not drive around barricades, and never drive or walk through flood water.”

Road condition updates will be posted on 511.alaska.gov.

Update 7:15 p.m. Wednesday

All tour operators, taxi companies, and car rental companies are asked to avoid travel to possible flood zones. That’s according to a statement from Unified Command for the 2026 Glacial Lake Outburst Flood. 

Unified command warns tourism to the Mendenhall River, evacuation areas, and all associated neighborhoods could pose “a major risk to life safety” and could impede rescue efforts from first responders. 

The Flood Information Hotline is taking calls 24 hours a day at (907) 500-0890.

HESCO barriers surround Ann Lind’s house on Marion Drive on Wednesday, Aug. 12, 2026. (Photo by Clarise Larson/KTOO)

Update 6:33 p.m. Wednesday

On Wednesday afternoon, Sen. Lisa Murkowski flew over Mendenhall Glacier in a helicopter and saw glacial outburst floodwater pouring out of Suicide Basin.

“You can see the hole in the ice at the base, the toe of the glacier, where it is flowing through,” Murkowski said.  

At a press briefing after the flight at Coastal Helicopters around 5 p.m., she said the current rushing from that hole looked like it had increased as she flew over it again on her way back down.

Murkowski flew with Jose Sanchez, director of engineering and business for the Pacific Ocean Division of the U.S. Army Corps of Engineers. He said he doesn’t want to get ahead of the “imminent” announcement of a request for proposals, or RFP, for an innovative solution that could leverage public-private partnerships. 

But Murkowksi said she’s advocating for the Army Corps to dig a tunnel through Bullard Mountain to drain Suicide Basin — a long-term solution that would protect the entire valley. The tunnel, or lake tap, has drawn broad support from local leaders and the community. 

“There is no interest in anybody to going back to, quote, ‘the drawing board,’” Murkowski said. “These temporary solutions that we have in place are temporary, and we need to get to the enduring solution.”

A Murkowski staffer said she’ll be leaving Juneau before the flood crests.

Alaska Republican U.S. Sen. Lisa Murkowski speaks to a group of reporters in Juneau as the Mendenhall River rises on Wednesday, Aug. 12, 2026. (Photo by Clarise Larson/KTOO)

Anticipating the glacial lake outburst flood, the City and Borough of Juneau and the Central Council of the Tlingit & Haida Indian Tribes of Alaska have requested immediate assistance from the State of Alaska. That’s according to a joint press release issued Wednesday afternoon. 

The two governments request that the state:
• Issue a State Disaster Declaration to fully activate state disaster authorities and resources
• Have emergency response equipment and personnel positioned and ready in case of a flash flood, and
• Activate expedited permitting processes for emergency riverbank stabilization and other necessary protective work. 

The release also calls for improved communication and coordination, emergency protective orders, and long-term assistance from both the state and federal governments.

Tlingit & Haida and CBJ already issued preemptive emergency disaster declarations as a proactive measure. 

According to the joint press release, CBJ and Tlingit & Haida are confident in the HESCO barriers, however officials emphasize that “no chances will be taken when it comes to public safety and emergency preparedness.”

While it’s unusual to declare disasters before damage occurs, Gov. Dunleavy did so in 2025.

Update 1:52 p.m. Wednesday

The National Weather Service in Juneau is now forecasting the flood will crest between 8 a.m. and noon on Thursday, still between 16.1 and 16.6 feet. That’s according to a 1 p.m. update. 

Release of Suicide Basin is ongoing. The river is at 6.54 feet and rising as of 1:30 p.m.

The National Weather Service Juneau’s forecast timeline leading up to the crest:

• Minor flood, 9 feet, around 9:30 pm today

• Moderate flood, 10 ft, around 11:30 pm today

• Major flood, 14 feet, around 5:45 a.m. Thursday

An updated screenshot from the National Weather Service’s page on Suicide Basin.

Update 12:30 p.m. Wednesday

Residents within the flood zone should leave the area by 3 p.m. today, Wednesday. 

“Evacuating is absolutely the best way to keep yourselves, your neighbors and first responders safe during this event,” said the city’s emergency programs manager, Ryan O’Shaughnessy, during a press conference Wednesday morning. 

“None of this is worth betting your life on,” he said.

City and Borough of Juneau’s emergency programs manager, Ryan O’Shaughnessy, speaks during a press conference on Tuesday, Aug. 11, 2026. (Photo by Clarise Larson/KTOO)

If the flood breaches the barriers, the National Weather Service would issue a flash flood warning and instruct residents still in the flood zone to shelter in place. That means people should get to the highest point wherever they are, like the second story of a home, and not attempt to evacuate. Anyone in an emergency should call 911 immediately.

Officials at the press conference announced a number of closures or service modifications:

• Capital Transit buses will continue running in the area until 5 p.m. Wednesday to assist with evacuations. At 5 p.m., Capital Transit routes will no longer be operating in the evacuation area.

• Back Loop Bridge is scheduled to close at 8:30 p.m. Wednesday.

• Brotherhood Bridge will be closed to pedestrians when the lake level reaches 10 ft, which is forecasted to occur around 11:30.

• A temporary flight restriction is in effect over the flood zone as of 8 a.m. Wednesday to allow Department of Transportation drones to monitor the barriers.

• The Mendenhall Glacier Visitor Center will close at 4 p.m. Wednesday. Access to the campground and the west side of Mendenhall Lake has already been closed.

An emergency shelter is open at the Floyd Dryden Gymnasium, including an area for pets. Six people stayed at the shelter Tuesday night, Loren Jones of the American Red Cross said.

Read the full story here. See the full press conference below.

Update 9:50 a.m. Wednesday

Release of Suicide Basin is ongoing. Water levels are increasing as the basin drains. The river is at 5.77 feet and rising as of 9:15 a.m.

Crest timing: 5 a.m. to 9 a.m. Thursday morning
Crest height: 16.1 to 16.6 ft

The National Weather Service Juneau’s forecast timeline leading up to the crest:

• Minor flood, 9 feet, around 3 pm

• Moderate flood, 10 ft, around 5 pm

• Major flood, 14 feet, late tonight/early Thursday morning

The 2026 Juneau Glacial Lake Outburst Flood Joint Information Center will hold a press briefing at 11 a.m. today. Tune in above, or listen on KTOO 104.3 FM and 91.7 FM. 

Update 10 p.m. Tuesday

Kaxdigoowu Héen Elementary, Mendenhall River Community School, Thunder Mountain Middle School and the district office will be closed to the public Wednesday and Thursday. 

All staff and administrative offices at these facilities are temporarily relocating to the Dzantik’i Heeni campus at 1600 Renninger St. For in-person assistance with registration, enrollment or other administrative questions, staff will be set up and available at 10:30 a.m. on Wednesday.

The district wants families to prioritize safety. 

“If your family is actively preparing for potential flooding, securing your home, or filling sandbags, please prioritize your family’s safety. Do not worry about immediate registration deadlines or missing paperwork — we will gladly work with you to ensure your student is ready for the August 20 start date once the situation has passed,” said a district information release,” Superintendent Shawn Arnold said in a letter to families. 

Administrative offices at all non-Valley campuses will remain open with their normal pre-service hours.

Juneau-Douglas High School: Yadaa.at Kalé student registration will still take place as scheduled. JDHS sports practices that have been scheduled should be confirmed through the coach.

Update 7:25 p.m. Tuesday

The City and Borough of Juneau is closing several facilities ahead of the imminent flood on Wednesday and Thursday including: 

• Mendenhall Valley Public Library

• Dimond Park Field House

• Dimond Park Aquatic Center

• Nearby fields: Dimond Park, Melvin Park, Mendenhall River Community School

Trail closures include:

• Kaxdigoowu Heen Dei Trail

• Juneau International Airport’s Emergency Vehicle Access Road or EVAR, which is also known as the Airport Dike Trail

The city recommends residents in the flood zone to evacuate Wednesday as well.

A screenshot from the National Weather Service’s page on Suicide Basin.

Update 7 p.m. Tuesday

The City and Borough of Juneau is recommending residents in the flood zone to evacuate Wednesday. Flooding is expected along Mendenhall Lake and River Wednesday evening into Thursday morning. 

CBJ is recommending the following evacuation routes to avoid congestion and road or bridge closures: 

• Residents north of Division Street, please travel north on Riverside Drive, toward Mendenhall (Back) Loop Road and out of the inundation area. 

• Residents south of Division Street, travel south on Riverside Drive, turn left on Stephen Richards Memorial Drive, towards Mendenhall Loop Road. 

• On Rivercourt Way, travel south on Riverside Drive, toward Egan Drive 

• On the west side of the Mendenhall River, travel west on Mendenhall (Back) Loop Road toward Auke Bay (avoid Back Loop Bridge). 

• West of Brotherhood Bridge, travel west on Glacier Highway toward Auke Bay 

An American Red Cross evacuation shelter will be available at the Floyd Dryden Gymnasium at 3800 Mendenhall Loop Road starting tonight at 8:30 p.m. While the shelter will be open and staffed tonight, the city – again – recommends evacuation tomorrow.

The Red Cross will have limited space to shelter pets, however Juneau Animal Rescue is also offering emergency sheltering for animals. JAR has also provided resources to help pet owners prepare for evacuation. 

Non-emergency concerns can be directed to the city’s 24-hour Flood Information Hotline at 907-500-0890. If you or someone else is experiencing a life safety emergency, call 911 immediately.  

CBJ is also providing emergency alerts via SMS by texting CBJ to 38276 or signing up here.

Update 5 p.m. Tuesday

The National Weather Service issued a glacial outburst flood warning, alerting the public that the flood has begun, at 4:41 p.m. on Aug. 11. That’s just eight hours after the alert went out that Suicide Basin was full. 

The Weather Service forecasts the flood will crest between 16.1 and 16.6 feet sometime between 5 a.m. and 9 a.m. Thursday. 

Aaron Jacobs, senior service hydrologist at National Weather Service, speaks during a press conference on Tuesday, Aug. 11. (Photo by Clarise Larson/KTOO)

Aaron Jacobs is the senior service hydrologist at the Weather Service. At a press conference organized by the multi-agency unified command Tuesday afternoon, he said he’s not anticipating this flood will break the 16.65 foot record set last year. An atmospheric river struck at around the same time Suicide Basin released in 2025, raising the river level before floodwaters hit. This year, there’s sun in the forecast instead.   

At the press conference, officials strongly encouraged residents in the flood zone to evacuate.

Although officials said that the HESCO barriers are ready and built to the highest standards, City Manager Katie Koester emphasized that being near the barriers while the river rises can be life- threatening.

“Please evacuate. While the HESCO barriers, you know, are stronger than they’ve ever been, we really cannot rely on them and life safety is absolutely the most important thing,” Koester said. 

That was echoed by Jacqueline Pata, vice president of the Central Council of the Tlingit & Haida Indian Tribes of Alaska.

“I’m going to say to our 422 tribal citizens in the evacuation zone, please pay heed to the warnings,” Pata said. “Please make sure that you’re prepared.” 

Jacobs said to check the Suicide Basin monitoring page for an updated forecast once the release begins and as it progresses. About a day after the flood starts, the National Weather Service might update the forecast. 

In the city’s “ready, set, go” structure, the current risk is at “go.” See more information from CBJ here.

Update 1:20 p.m. Tuesday

The 2026 Juneau Glacial Lake Outburst Flood Joint Information Center will hold a press briefing at 3 p.m. Tune in above, or listen on KTOO 104.3 FM and 91.7 FM.

Presenters include:

  • Aaron Jacobs – Senior Service Hydrologist, National Weather Service
  • Brigadier General Joseph “Clete” Goetz – Commanding General, U.S. Army Corps of Engineers, Pacific Ocean Division
  • 2026 Juneau GLOF Unified Command: Sabrina Grubitz (Tlingit & Haida), Ryan O’Shaughnessy (City and Borough of Juneau), Captain Ginny Nadolny (USCG Sector Southeast Alaska)
  • Jacqueline Pata – First Vice President, Tlingit & Haida
  • Katie Koester – City Manager, City and Borough of Juneau
  • Travis Eckhoff, Alaska Department of Transportation & Public Facilities, Southcoast Region

The agenda includes a short briefing from the National Weather Service, an overview of agency response and preparedness actions to the Glacial Lake Outburst Flood and more about what residents can expect from coordinating agencies as the river begins to rise.

Updated 10:44 a.m. Tuesday

Aaron Jacobs, the senior service hydrologist at the National Weather Service in Juneau, said the initial forecast is a 16.1 to 16.55 foot flood on the Mendenhall Lake gage, or between 45,000 and 47,500 cubic feet per second of water flowing down the river.

“The event hasn’t started yet,” Jacobs said. “We could see some minor fluctuations throughout the week that could adjust that range by a couple tenths of a foot.”

That initial forecast is a bit lower than the record-breaking 16.65 foot flood last year, which peaked at 48,873 cfs.

Jacobs said to check the Suicide Basin monitoring page for an updated forecast once the release begins and as it progresses. About a day after the flood starts, the National Weather Service might update the forecast.

Once the flood begins, the Red Cross will set up an emergency shelter at Floyd Dryden Middle School.

Read the full story here.

Updated 10 a.m. Tuesday

Suicide Basin is currently full and expected to release within 1-6 days. Residents in the inundation area should finalize last-minute preparations, confirm evacuation plans and prepare a go-bag.

The City and Borough of Juneau issued an emergency text alert at 8:39 a.m. this morning notifying Juneau residents that the basin is full.

In the city’s “ready, set, go” structure, the current risk is at “set.” See more information from CBJ here. 

Another alert will be issued as soon as it begins to release. 

Find the latest Suicide Basin forecast from NOAA here. 

See if you live in the evacuation advisory zone here

 

KTOO’s Alix Soliman, Jamie Diep, Lisa Phu and Brian Venua contributed as well as Alaska Public Media’s Eric Stone and Alaska Beacon’s Corinne Smith. 

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