Crews had been surveying a tender patch of highway and decided this morning to limit it to one-way traffic until they can rebuild. From the WA State DOT website:
WSDOT is preemptively reducing SR 542 to one lane of traffic approaching Glacier Springs due to erosion from the Nooksack River.
During the two-week period from Nov. 21 to Dec. 5, 2014, runoff in the Nooksack River from heavy rainfall washed away between five and six feet of the embankment near the shoulder of the eastbound lane. Gov. Jay Inslee signed a proclamation on Dec. 10, 2014, declaring a state of emergency on this stretch of highway. The declaration allows WSDOT to seek $3 million in emergency relief funds from the Federal Highway Administration to repair or relocate the damaged section of the highway. Realigning the highway to the north, farther away from the river, will maintain the only road link to eastern Whatcom County and the Mount Baker area.
During the winter ski season, this section of SR 542 carries approximately 2,000 vehicles a day each weekday and 3,000 vehicles a day each weekend, as visitors head to and from the Mt. Baker Ski Area. The Mount Baker area and Artist Point are also popular summer tourist destinations.
Here's a short video with a camera on a pole showing the undercutting of the pavement:
Back in 2009 (IIRC), the town of Glacier was cut off entirely due to a slide at the same location.
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