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Natural phenomenon at Great Sand Dunes National Park creates awesome waterslide

Travel + Leisure logo Travel + Leisure 6/13/2017 Talia Avakian

medano creek tubing © Flickr/Great Sand Dunes National Park and Preserve medano creek tubing Each year, a rare natural phenomenon transforms Great Sand Dunes National Park and Preserve’sMedano Creek into a water lover’s paradise.

A recent video from the National Park Service explains the phenomenon, called surge flow, which occurs when melting snow from the creek’s nearby peaks cascades down onto the sand ridges, causing the sand to create underwater ridges which in turn produce waves that can occur as often as every 20 seconds during the spring and early summer.

According to Nicholas Scarborough, an educational ranger at the park, surge flow can only occur in places that have a sandy creek bottom free of any pebbles or stones.

The reason for this is because when the sand stands on its own, it begins to form antidunes when water cascades over it, creating little ridges below the surface where water pressure builds up and eventually creates flowing waves when it finally releases.

This is a rare phenomenon in Medano Creek known as "surge flow" where rhythmic waves cascade across a sandy creekbed and then get absorbed back under the sand. #greatsanddunes #colorado #adventure #medanocreek

A post shared by Haley (@grupgirl) on Jun 11, 2017 at 7:04pm PDT

Since Medano Creek begins at snowfields that sit high in the Sangre de Cristo Mountains, when that snow begins to melt as temperatures rise, a surge of water kicks up in the shallow creek, making it an ideal location for activities like tubing and wakeboarding.

"It really looks like a beach party when you go down there," Scarborough told Travel + Leisure. "People have tents set up where they’ll have picnics next to the creek, while kids splash around in the water and make sand castles and their own little dams out of the sand."

Mountains, dunes and a creek #greatsanddunes #medanocreek #colorfulcolorado #beautyofnature

A post shared by Usha Radhakrishnan (@usharadhakrishnan) on May 30, 2016 at 7:12am PDT

That’s why rangers at the park refer to it as "Colorado’s natural beach," with the base of the creek surrounding the park’s natural dunes creating quite the view.

Medano Creek is currently approaching its peak flow, according to Scarborough, and will dry up towards the end of July, giving you a bit more time to enjoy the fascinating natural effect in person.

Entrance for the park starts at $7 per visitor.

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