Waterfall at Temple of Sinawava during peak flow following spring rainstorm.  Zion Canyon, Zion National Park, Utah

Temple Of Sinawava

Vernal Falls at peak flow in late spring, with a rainbow appearing in the spray of the falls, viewed from the Mist Trail, Yosemite National Park, California

Vernal Falls at peak flow in late spring, with a rainbow appearing in the spray of the falls. Yosemite National Park.

A rainbow appears in the mist of the Lower Falls of the Yellowstone River.  At 308 feet, the Lower Falls of the Yellowstone River is the tallest fall in the park.  This view is from Lookout Point on the North side of the Grand Canyon of the Yellowstone.  When conditions are perfect in midsummer, a midmorning rainbow briefly appears in the falls, Yellowstone National Park, Wyoming

Rainbow, Lower Yellowstone Falls, Grand Canyon Of The Yellowstone

Horsetail Falls backlit by the setting sun as it cascades down the face of El Capitan, February, Yosemite Valley, Yosemite National Park, California

Horsetail Falls In Winter, Sunset's Last Light, Yosemite National Park.

Paradise Falls tumble over rocks in Paradise Creek, Mount Rainier National Park, Washington

Paradise Falls, Mount Rainier National Park, Paradise Creek

Yosemite Falls and star trails, at night, viewed from Cook's Meadow, illuminated by the light of the full moon, Yosemite National Park, California

Yosemite Falls And Star Trails

Yosemite Falls and rainbow, Half Dome in distance, viewed from the Yosemite Falls trail, spring, Yosemite National Park, California

Yosemite Falls, Rainbow And Half Dome From Yosemite Falls Trail

Archangel Falls in autumn, near the Subway in North Creek Canyon, with maples and cottonwoods turning fall colors, Zion National Park, Utah

Archangel Falls In Autumn In Zion National Park

Fly fishing below Gibbon Falls. This flyfisherman hiked up the Gibbon River to reach the foot of Gibbon Falls, Yellowstone National Park, Wyoming

Flyfishing At Gibbon Falls, Gibbon River

Yosemite Falls reflected in flooded meadow.  The Merced  River floods its banks in spring, forming beautiful reflections of Yosemite Falls, Yosemite National Park, California

Yosemite Falls reflected in flooded meadow. The Merced River floods its banks in spring, forming beautiful reflections of Yosemite Falls. Yosemite National Park.

Sol Duc Falls.  Sol Duc Falls is one of the largest and most beautiful waterfalls in Olympic National Park, seen here from a bridge that crosses the canyon just below the falls. Surrounding the falls is an old-growth forest of hemlocks and douglas firs, some of which are three hundred years in age, Sol Duc Springs

Sol Duc Falls, Sol Duc Springs

Multnomah Falls.  Plummeting 620 feet from its origins on Larch Mountain, Multnomah Falls is the second highest year-round waterfall in the United States.  Nearly two million visitors a year come to see this ancient waterfall making it Oregon's number one public destination, Columbia River Gorge National Scenic Area

Multnomah Falls Panorama, Columbia River Gorge National Scenic Area, Oregon.

Narada Falls cascades down a cliff, with the flow blurred by a time exposure.  Narada Falls is a 188 foot (57m) waterfall in Mount Rainier National Park

Narada Falls, Mount Rainier National Park

Darwin Falls in Death Valley, near the settlement of Panamint Springs.  The falls are fed by a perennial stream that flows through a narrow canyon of plutonic rock, and drop of total of 80' (24m) in two sections, Death Valley National Park, California

Darwin Falls In Death Valley, Death Valley National Park

Waterfall at Temple of Sinawava during peak flow following spring rainstorm.  Zion Canyon, Zion National Park, Utah

Temple Of Sinawava

Vernal Falls at peak flow in late spring. Hikers are seen at the precipice to Vernal Falls, having hiked up the Mist Trail to get there, Yosemite National Park, California

The Brink of Vernal Falls. Hikers are seen at the precipice to Vernal Falls, having hiked up the Mist Trail to get there.

Fern Springs, a small natural spring in Yosemite Valley near the Pohono Bridge, trickles quietly over rocks as it flows into the Merced River, Yosemite National Park, California

Fern Springs, Yosemite Valley