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.
Did You Know?
More species of fish are found in the Niobrara River and its tributaries than any other Nebraska stream. Click "More" to visit the Niobrara National Scenic River "Fish & Crustaceans" page. More...