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David Nowatzki of the ND Forest Service walks around the perimeter of one of several 30 foot deep sinkholes at the Pembina Gorge near Walhalla, N.D., on Tuesday. (Eric Hylden/Grand Forks Herald)

Sinkholes surface along Keystone route

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PEMBINA - A small series of sinkholes -- some 30 to 40 feet deep that have swallowed a handful of 20- to 30-foot pine trees -- developed this spring in the sandy soil of the Pembina Escarpment along the TransCanada Keystone Pipeline route, limiting access to a spectacular panoramic view of the Pembina Gorge from a North Dakota Forest Service lookout.


The first sinkhole was discovered in March on the pipeline right-of-way along the Cavalier-Pembina county line.

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