In 2026, by midsummer people will be crossing a new bridge that will eliminate an environmental hazard that has been a symbol of climate changes in Alaska.
In the meantime for the foreseeable future, National Park Service and the tourism industry will have to deal with another three years of closures that will begin around the halfway mark of the park’s sole road in order to prevent continuing landslides on a sloping and dangerous site known as Pretty Rocks.
The site was once a bend at the point of mile 45 on the road’s 92-mile length, a spot that is famous for its stunning views of a valley dubbed The Plains of Murie A section of the road has disappeared and has left a massive drop-off. When the sun shines on this rock on its north-facing side the same way as was the case on the very first day of Friday of May the dirt clumps and rock tumble downwards down the hill.
In the month of August 2021 the road was shut down in August of 2021 and that stretch was functional, but it was considered to be unsafe for public use. The dangers were clear, said Dave Schirokauer, Denali’s science and resource team director. He pointed to a spot that was on the road that is now collapsed section.”Right across the corner we could see the ice. Permafrost that was extremely ice-rich was on the surface and was quite apparent,” he said during an excursion on May 5.
Pretty Rocks got this way in a Hemingway-like style: slowly, then suddenly.
The slope was sloping little in the 1960s, and probably for many decades before that as per the parks service. However, prior until 2014, the slope caused minor problems, with only occasional tiny cracks in the road’s surface as per park officials. As the temperature continued to warm, the slope movement, determined in inches prior to 2014 grew to inches per month in the year 2017 in 2018, inches per week the next year, and inches each day for 2019, and for 2021 0.65 ins/hour as per park authorities. A slack in the summer of 2021 caused a sudden road closure as well as an early conclusion to certain Denali excursions.
The plan to open the road to Pretty Rocks, expected to cost $100 million, is a challenge. The location is extremely remote and steep. The bridge needs to be suitable for permafrost conditions solid and sturdy enough to support tour buses as well as resist earthquakes, yet and yet subtle enough to blend in with the surroundings and constructed in a manner that reduces the impact on the wildlife and park visitors.
The design incorporates anchors to sit vertically or at angles. It also contains 23 thermosyphons, devices that extract heat of the ground to keep a small pockets of ice-rich permafrost found at a depth of 85ft below surface near the east end the park, according to Steve Mandt, the park engineer in charge of the project.
Site geology pushes back road opening
The geology of the site creates a complicated fix. Permafrost is layered over an ice glacier that is a frozen and melting conglomeration of rocks and Ice. There is clay that is thawed at less temperature than necessary to melt the ice. Rainwater infiltrates the whole thing and, based on the time of year, expands the ice, or speeds up melting. “So you’ve got rocks and rain that freezes, and you’ve got this massive layer of ice that’s shifting,” Schirokauer said.
The clay has been to be a particular problem. Recent findings that construction workers must remove the clay to a total of 80,000 cubic yards located on the western side of the proposed bridge site instead of the 30,000 originally estimated amount will result in a one-year delay to the time frame for completion of the project according to Denali spokesperson Sharon Stiteler.
The delay from 2025 road opening will hurt the tourism sector.
“With the extra delay, clearly, that is a bit disappointing,” said Jillian Simpson the chief executive officer and president for the Alaska Travel Industry Association. However, it is “a vital component of our infrastructure” and the industry is aware “how crucial it is to do the right route,” Simpson said.
“Denali is the foundation of tourism in exploring Alaska on the land,” Simpson said.
When the bridge opens, Denali will be busy with larger than normal crowds of tourists.
A camp on the gravel park’s site that is operated during the next two summers will accommodate 50 or more employees who will be shuttled between their vehicles on certain locations alternate with tour buses.
The road leading towards Pretty Rocks is narrow. Pretty Rocks site is so narrow that construction trucks have to be backed into because there isn’t enough space for larger vehicles to turn. There is a possibility of noise such as from pile driving, however the idea is to keep this to an absolute minimal level.
For visitors, it is another year of visiting the location known as East Fork at the road’s 43-mile marker which has an interim ranger station housed in an yurt with enough space for buses to stop.
“This will be the first Eielson,” Schirokauer said in reference to the temporarily shut Eielson Visitors Center located at the road’s 66 mile point which is a frequent stop and turnaround spot.
In the year that was the first year that was a full-time period of the closure of Pretty Rocks, visitation decreased from the extreme lows that resulted from the COVID-19 epidemic but it was less than 88% of levels before 2020, according an analysis conducted by the Alaska Department of Labor and Workforce Development. The visitors who visited Denali were intrigued by the landslide, park employees stated. A lot of people who took the bus to the maximum extent they could to East Fork, the East Fork turnaround, walked the extra mile to take a look at the area in person, Stiteler said.
This year will be the biggest year for Alaska, and with Alaska set to host the record of 1.6 million cruisers The crowds are expected to grow. However, Denali will be able to cope with the increase in traffic even if half of the road is shut, according to Brooke Merrell, the park’s chief of staff.
“We believe we had an adequate practice this year to ensure we’re doing it right,” she said. “We are confident that we will be capable of accommodating it with the roads we’ve got for this season.”
It is still possible to walk through Pretty Rocks to the western portion of the park.
Access is via a stairway steep that leads from to the East Fork bus terminus to the valley of the river below. A quarter of passengers who took the shuttle bus this year decided to take this descent for short strolls or longer walks according to the park’s staff.
Backcountry visitors with valid permits can continue to go and explore area that is currently not accessible to the park’s access roads. Travelers with a good net worth can, in addition travel to Kantishna, the area of private property at near the top of the highway and stay in luxurious lodges, where the daily rate is more than $1,000.
What are the effects of construction on Alaska tourism
The industry of tourism is adapting to the changing environment.
Local businesses, the last year was the year of a “mixed mix,” with some operators benefiting from the increased traffic that comes from shorter bus routes, but others struggled, according to Vanessa Jusczak of the Denali Chamber of Commerce located in Healy. Companies that offered excursions had a higher volume of business however, restaurants with fewer staff were affected by the influx of customers at normal not high-volume times, she wrote via email.
The situation in Anchorage the summer of this year, Denali-bound travelers appear to be aware of the closure of the road according to Jack Bonney, vice president of the Anchorage Convention and Visitors Bureau.
“It isn’t any impact on their decision about what they do in Denali and if they do,” the official said. Although “the closure is at the back of everyone’s minds,” the park continues to be viewed as an attractive place to visit according to him.
A lot of people are impacted by the road’s closure. Park service officials are currently conducting an investigation of bears to find out how the lack of traffic impacting the animals, Schirokauer said. The goal is to tag 18 to twenty animals. the majority in the east area of Pretty Rocks and the other portion on the west side of the park where roads are closed the park said.
The number of land slides is increasing across the north
Although Pretty Rocks is a dramatic and obvious case due to its location and the disruption it causes The landslides that result from thaws are increasing throughout the north.
In of the Denali road corridor there are more than 140 potential landslide locations have been mapped out.
As with other roads along other roads in Alaska there are risks in other national parks as well as locations in the vicinity of parks. They are Slate the Creek on the Parks Highway just outside Denali’s entry point, where the permafrost freeze is combining with intense rainfall to create possible issues with maintenance and threats to the recently-installed fiber-optic cable as well as other infrastructure. Also, The Dalton Highway, the sole land route that leads to northwestern Alaska’s North Slope oil fields, in which the thawing ” frozen debris lobes” consisting of ice, dirt, rocks and vegetation are moving downslope and causing shifts and modifications. East of Alaska and in the Canada’s Northwest Territories, thaw-triggered landslides and slumps are gnawing away on and destroying the Dempster Highway.
When you are away from the roads, huge dangers are posed by thawing mountainides particularly of coastal mountains, where dumping debris could result in localized tsunamis. One of the hot spots for landslides is the northern region of Southeast Alaska, where tall mountains rise up from glacial Fjords. In the area, as well as in adjacent regions within Canada; the pace of landslides accelerates by the combination of glacial retreat and the thawing of mountain permafrost that weakens slopes. In the year 2015 at Taan Fjord, a coastal region of The Wrangell-St. Elias National park, the slope of a mountain fell down, releasing debris and rocks into the ocean and triggering a tsunami that grew to 630 feet, which is the fourth-highest recorded. The tsunami did not affect anyone else in the event, but the tale was distinct in Greenland in the year 2017 after a huge land slide in a glaciated region resulted in the creation of a tsunami which caused the deaths of four people.
In Denali The Pretty Rocks bridge will not be the last piece of work. The federal funds secured to construct the bridge meant to cover a subsequent phase of work to tackle an unstable area less than a mile the east. This is called Bear Cave.
The story first appeared in Alaska Beacon and is republished here with permission.
