The geology of the sandhills, with its ridges and dunes, is shaped by wind from above and influenced below by the massive Ogallala aquifer. This underground lake seeps upward through sand and porous rock, resulting in lakes and wetlands. There are also numerous waterfalls along the river's path including Smith Falls Nebraska's highest. The falls is accessible via a trail leading into Smith Falls State Park, where the cataract plummets nearly 70 feet.
Camping is available in the park and makes a nice spot to break up the trip.
Logistics Beyond Smith Falls the river requires more concentration. There are rapids, rock ledges, and riffles to contend with. Fritz's Island, which precedes a runnable stretch of whitewater, breaks one section of water, known as Fritz's chute. A few miles further is Rocky Ford, a rapid that must be portaged followed by another drop at Franklin's Rapids requiring another portage. Beyond Franklin's Rapids, the river picks up further momentum at Egelhoff's Narrows before broadening out again.