We also climbed the rocks beside a roaring run of white-water rapids on rivers that have never been navigated.

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The two are working on an economic-impact study of the restoration initiative that would create white-water rapids downstream of the city's largest spillway dam.

WSJ: Real Rapids in Grand Rapids?

Streams running off the southeastern slopes of the Andes soon turn into boisterous rivers with plenty of class III and IV white water rapids.

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Below the 68ft-tall Cumberland Falls, about 110 miles south of Lexington in Cumberland Falls State Park, there are simple places to practice white water rafting -- most of the rapids are Class II or Class III, and the rapids are well spaced out.

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Eight small boats exploring stretches of the Hudson opening to canoeists in the central Adirondacks all made it through seven moderate rapids interspersed with long flat-water stretches on a 7.3-mile trip through deep forests of evergreens and hardwoods.

WSJ: OUT THERE: Upper Hudson opening to canoeists

Advocates for the rapids have suggested the installation of an inflatable dam upstream that could better regulate water levels around the season to insure better rowing conditions.

WSJ: Real Rapids in Grand Rapids?

With an outstanding selection of rivers, there are choices suitable for all levels, from fun Grade 2 and 3 rapids, to hardcore rides with waves that will flip you into raging torrents of water (if that is your thing).

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Depending on the water level, the whitewater on the 7.3-mile stretch can range from nearly Class III rapids to rocky riverbeds that require walking, he said.

WSJ: OUT THERE: Upper Hudson opening to canoeists