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sand dune erosion

South Manitou Island Lighthouse
Sleeping Bear Dunes National Lakeshore / Flickr / http://michrad.io/1LXrdJM

The Sleeping Bear Dunes National Lakeshore has experienced a lot of damage the past few years, from battering storms to rising water levels.

MLive reports that engineers have found the shoreline of the South Manitou Island Lighthouse has degraded significantly. The erosion worsened during the 2015-2016 winter. Park staff have outlined a $1 million plan to fix it.

National Park Service Collection

A popular spot in the Indiana Dunes National Lakeshore will remain closed for the summer because of the mysterious appearance of holes in the 126-foot sand dune's surface.

Last July, a six-year-old boy was almost killed when a collapsing hole at Mount Baldy buried him in sand. Since then, two more holes and some depressions have been found.

So far scientists cannot explain why. That's despite the use of ground-penetrating radar and research analysis by scientists from the National Park Service, Indiana University, and the Indiana Geological Survey.

Scientists are getting ready for a more comprehensive investigation of the sand dune this summer.