Surge flow
Surge Flow Waves

NPS photo

A unique feature of the Niobrara is a phenomenon known as surge flow. The river's combination of velocity, gradient, and sediment load cause the formation of sand ridges that result in short-term standing waves. Click for the bulletin on surge flow. You will need Acrobat Reader to open this file.

Surge flow is recorded at one other National Park Service site; Great Sand Dunes National Park and Preserve, in Colorado.

Contact the Park

Mailing Address:

214 W US Highway 20
Valentine, NE 69201


(402) 376-1901
Call us during regular business hours to speak directly with a park ranger.

Contact Us