CRESCENT CITY (CBS SF) — A massive landslide has shut down Highway 101 at the troublesome Last Chance Grade south of Crescent City, state transportation officials said Sunday.

According to a state study, the segment of 101 “between Wilson Creek and Crescent City crosses terrain that is particularly rugged and landslide prone, especially the 2 ½ miles north of Wilson Creek known as Last Chance Grade.”

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It has been the site of several landslides in the past.

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Caltrans said its crews were working around the clock to remove the tons of rock, dirt and trees that tumbled onto the roadway in the slide.

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“We estimate one-way traffic control may begin this afternoon assuming no additional slide activity occurs,” Caltrans District 1 officials posted on their Facebook page Sunday.