Mike from Scenic Safaris checked it out yesterday. It is blocking the road and still moving. He said you could hear the trees cracking as you stood next to it. His opinion is that maybe a very good rider could ride along the ridge above the slide, but the trail rider is out of luck.
***What this slide means for guests of the Rockin' M or riders in Alpine: The slide is at mile 17 which is beyond trail C and D. Trail C departs at mile 4 and comes back to the Greys River at mile 14 (Murphy Creek). Trail D (little Greys) cuts off at mile 7. Unless you are planning on riding to the Box Y for lunch (28 miles) or trying to get to Blind Bull, which is now about a 50 mile ride, due to the Blind Bull slide, it does not have much of an impact on the majority of our guests or riders in Alpine. When I guide full day tours (trail rides with some off trail) I would either go to the Box Y or I would ride the trail system closer to town. A good alternative route (closer to Alpine), rather than going to the box Y that has more off trail opportunities is: Ride 4 miles from the lot, take a right on trail C, ride the trail C loop back to the Greys River, go left at trail A heading downstream towards trail d, make a right at trail D (mile 7), continue up the little greys trail, one option is the elk mountain trail which across from Aspen Hollow(intermediate/advanced riding). If you do not wish to go up Elk mountain, continue up to the McCain Cabin area where there are a bunch of great play areas. From the McCain cabin loop back through Bull Hollow and pick up D trail back to Alpine. This is a great way to spend a day without any sections of the trail being to long and many frequent opportunities to get off the trail to play. There is also some great Boondocking across the little Greys river on Middle Ridge opposite Bull Hollow. I hope this info helps anyone that may be concerned about the slide impacting their Greys River riding.
Below is an article from the Jackson Hole newspaper which gives some better details of the slide.
A massive landslide that could disrupt access into the Wyoming and Salt River ranges for months is slowly overtaking the most heavily trafficked road in the Bridger-Teton National Forest.
Seventeen miles down Greys River Road from Alpine a block of earth is splitting off Middle Ridge, an 8,900-foot timbered ridgeline that divides the Greys and Little Greys rivers. The mountainside likely started moving Feb. 1, when a magnitude 3.4 earthquake struck the exact location, according to the U.S. Geological Survey.
By last weekend, the landslide was active enough that it started contorting and buckling the surface of a popular winter snowmobiling route — and threatening to do much more.
“In my opinion, it’s going to completely take out 300 to 500 yards of the Greys River Road,” said Mike Oltman, engineer and mineral staff officer for the Bridger-Teton.
“It’s huge, and it’s moving all the way into the Greys River,” he said. “It’s going to be quite costly to fix.”
Oltman estimated that the slide is moving 10 to 20 feet a day, with most activity coming during warm afternoons.
“My prediction is if we get a day with lots of rain,” he said, “or it’s 40 degrees and sunny, we’re going to see really significant movement.”
Bridger-Teton officials have closed part of the area because of the hazard of the continually moving earth. One snowmobiler validated the danger Tuesday by ignoring caution signs. He was thrown from his sled after hitting a damaged portion of the road. He sustained “severe injuries,” Oltman said, including broken bones in his face and serious lacerations.
Anyone who ignores the closure and tries to traverse the active landslide is taking a “tremendous risk,” Oltman said.
In the middle of the day Tuesday, he watched a 20-foot-wide chunk of what looked like solid ground at the landslide’s crown slowly erode and fall down the hillside.
The falling flank of mountain hasn’t yet dammed the Greys River, but it has the potential to do so. Northwest Wyoming landslides have formed new small lakes in recent years in places like the Gros Ventre Range’s Crystal Creek and on Willow Creek, on the Hoback River side of the Wyoming Range.
Oltman said the landslide appears similar in scope to the nearby Blindbull Slide, which piled 60 to 80 feet of debris over 300 to 400 yards of Forest Road 10123 during the big melt of spring 2017. The Bridger-Teton secured funds to fix the dead-end road from an emergency relief fund for federal roads, and Oltman has already put in an application for funding from the same program for the new landslide.
One distinction between the two geological events is that the still-moving landslide is in the process of taking out a heavily used route.
“It would be magnitudes more disruptive,” Oltman said.
Greys River Road, he said, attracts more than 400 vehicles a day during peak summer use — more than even the Gros Ventre or Green River Lakes roads.
It’s also the easiest access to the Box Y Lodge and Ranch, which is keeping its business up and running for the winter. Lodge staff members have been snowmobiling groceries in from Alpine, walking the goods across the debris path and hopping onto another sled to motor them the rest of the way to the ranch, co-owner Meagan Haberberger said.
“It doesn’t hinder our business as much as everyone thinks,” she said.
Daytime visitors are blocked for the time being, but overnight guests have still been able to reach the Box Y by snowmobiling in from the Green River side or from Afton, she said.
The Bridger-Teton has already identified a temporary winter reroute over the top of the landslide, and an alternative summer route is being investigated. But a long-term solution is not yet clear.
“Until this thing stops moving,” Oltman said, “we don’t have a good plan.”