Forest Service Employees and Public Left Unaware of Danger, Sources Say
By Soren Wuerth
TNews Editor
A hulking mountain face slowly sinking toward Portage Lake could collapse and send a massive wall of water hurtling into the Portage visitor center and down a valley six miles to Turnagain Arm, according to experts and a Forest Service emergency action plan.
Geologists fear a landslide-triggered tsunami more than 1,000 feet high could, like sloshing water in a bathtub, sweep through valleys, enter the 2.5-mile long Whittier Tunnel and even breach the 500-foot Portage pass, sending muddy water and debris into Passage Canal.
Yet, as catastrophic as it sounds—and given growing concern about landslides, sporadic news coverage and heightened awareness—few warnings have been issued about the possibility of a major disaster at a popular tourism destination that opens Friday.
"You think about some dramatic event like a tsunami on Portage Lake and it sounds pretty implausible until after it's happened. And that's kind of an instinct we, or at least a lot of people, have," said independent geologist Bretwood "Hig" Higman, who has consulted for the government on a number of landslide risk zones.
Portage's Begich, Boggs Visitor Center, a popular tourism destination that sees up to 1,000 visitors a day, sits directly in the path of a potential tsunami and 2.5 miles from the toe of Portage Glacier.
Higman estimated a catastrophic tsunami at Portage has one in 30 yearly chance of occuring and a wave that magnitude would give a person two to four minutes to evacuate. The landslide is currently moving at a rate of a meter per year.
There have already been three "dramatic" landslides at Portage, Higman said, one in 2022, another in 2024 that slipped down the glacier, and a third last September. "It went directly into the lake and I think it's big enough that if it had been moving a bit faster, it might have produced a dangerous tsunami," he said.
Similar landslides have happened in other coastal areas, including an incredible 1,500-foot wave from a landslide in Tracy Arm near Juneau last summer.
Portage, said Higman, is "flying those red flags a little more wildly," and September's event is "kind of a duh of risk factors for landslides, but I think it's a really important one."
"No explanation"
Though it has known about the tsunami threat for at least two years, the Chugach National Forest has kept its own employees and the public largely in the dark, Forest Service sources said.
Just weeks ago, an annual Forest Service meeting planned for the visitors' center at Portage was abruptly cancelled, employees said, adding they were offered no explanation.
"The Forest Service has not communicated about this at all," said an employee who spoke on condition of anonymity. "It's a bold decision and quite scary actually."
Reached by phone Wednesday, Glacier District Supervisor Chris Stewart referred questions to the Forest Service's public affairs department.
In a response to an email, Public Affairs Officer Amanda Wheelock wrote that the Forest Service is "partnering with other agencies to support community safety and preparedness".
Wheelock said her agency is evaluating the slope above the glacier and monitoring precipitation forecasts, among other things, "to determine if a temporary closure of the Begich, Boggs Visitor Center is necessary."
Read the entire story at the link below:
https://www.turnagainnews.org/articles/wgi9ksy0q9anl722d312tgv8c3zo5v