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Update 6/20 8:03 a.m.:

The Coldwater Lake Recreation Area and trail system are reopening after a months-long closure after a landslide closed the area.

Visitors can now stop in at the Mount St. Helens Science and Learning Center at Coldwater, located near milepost 43, between 10 a.m. and 4 p.m. daily.

The highway remains closed beyond Coldwater Lake past mile 45.2, which will remain closed for the remainder of the summer for clean-up and road repairs.

Original 5/23:

Days before the 43rd anniversary of the Mount St. Helens eruption, a mudslide wiped out an entire road and closed a popular tourist site.

Washington Department of Transportation (WSDOT) spokesperson Tamara Greenwell said a massive mudslide Sunday night was so big it demolished the 85-foot Spirit Lake Outlet Bridge and closed State Route 504 at milepost 43.

Eleven people and a dog were evacuated by helicopter after being stranded overnight on the far side of the Johnston Ridge observatory.

11 people, dog rescued at Mount St. Helens after mudslide blocks road

鈥淲e learned that there were some folks trapped on the other side [of the mountain], and Skamania County and King County assisted with the rescue of several people who are all safe now,鈥� Greenwell said.

鈥淢onday morning, our crews got better eyes on the slide鈥�what we’re calling a massive landslide. It took out an 85-foot bridge structure completely,” Greenwell continued. “Yeah, I was out there yesterday. And I was able to see sort of mangled and tangled bridge rebar. Like about half a mile downstream. It is a massive landslide.鈥�

The damage was so bad that crews could not assess how long the repairs would take.

“We got some drone video of it yesterday to get a broad scope of what we’re dealing with,” Greenwell said. “So, there’s still a lot of work and safety assessment that has to be done before we can develop a plan to reopen the roadway.鈥�

One of the biggest impacts is on the Johnston Ridge observatory because the wiped-out road takes visitors to the center; additionally, some of the buildings have reportedly lost access to the power grid.

Greenwell thinks this event will impact tourism in the short term; however, folks can still go up to Mount St. Helens, just nothing past milepost 43.

鈥淚 was up there yesterday, there are some beautiful lookout points that you can pull off at, to see the mountain,” Greenwell said. “And I think, you know, as long as folks are staying away from sort of the upper section of the highway, they’ll still be tourists going up there.鈥�

It鈥檚 too soon to say the cause of the landslide, but the initial assessment from geotechnical engineers is that the unseasonably hot temperatures drastically melted the snowpack, which then oversaturated the soils — loosening it enough to cascade down the mountain and taking out the bridge.

How does WA mountain snowpack water supply look this year?

WSDOT is working in coordination with the U.S. Forest Service, U.S. Army Corps of Engineers, U.S. Geological Survey, and Skamania and Cowlitz counties to determine what needs to be done to stabilize the soil in the area and rebuild the roadway.

鈥淎dditional safety analysis is needed, but due to the ongoing geological instability in the area, it鈥檚 too soon to tell when we鈥檒l be able to safely do that work,鈥� said Brad Clark, WSDOT Southwest Region Maintenance Manager. 鈥淲e appreciate everyone鈥檚 patience during this emergency.鈥�

On Monday, May 22, WSDOT Engineering Geologists began site reconnaissance of the slide area to collect ground data which will be used to cross-reference with the LIDAR information. Engineering Geologists are processing LIDAR data this week and will begin analysis work next week. This information will help inform when cleanup and repair work could begin.

There is currently no timeline for work to reopen the highway, and WSDOT said that travelers should plan for the highway to be closed for an extended period.

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