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Niobrara National Scenic River Bullfrog peers from a backwater
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Niobrara National Scenic River
Hydrology
Surge flow

NPS photo

Surge Flow Waves

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.

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Smith Falls

Did You Know?
Geologists have documented well over 200 waterfalls within the Niobrara River Valley. The tallest known falls is Smith Falls, which cascades 63 feet over a sandstone cliff. Click "More" to visit the Niobrara National Scenic River "Waterfalls & Springs" page.
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Last Updated: May 26, 2011 at 21:17 MST