Tim Fitzharris / Cascading waterfall in Jefferson National Forest, Virginia

Gerry Ellis / Still Creek in spring, temperate rainforest, Mt Hood National Forest, Oregon

Gerry Ellis / Falls on north fork Sauk River, Mt Baker, Snoqualmie National Forest, Washington

Steve Gettle / Cascading creek, Great Smoky Mountains National Park, North Carolina

Steve Gettle / Waterfall, Great Smoky Mountains National Park, North Carolina

Steve Gettle / Waterfall, Great Smoky Mountains National Park, North Carolina

Jeff Foott / Waterfall, Sweet Creek, Siuslaw National Forest, Oregon

Jeff Foott / Panther Falls, Columbia River Gorge, Washington

Jeff Foott / Waterfall and creek in fall, Cayuga Falls, Kitchen Creek, Ricketts Glen State Park, Pennsylvania

Jeff Foott / Waterfall in fall, Mohawk Falls, Kitchen Creek, Ricketts Glen State Park, Pennsylvania

Jeff Foott / Oneida Falls, Ricketts Glen State Park, Pennsylvania

Steve Gettle / Stream cascading through spring deciduous forest, Great Smoky Mountains National Park, Tennessee