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Along the trail, the Merced River is a tumultuous mountain stream, lying in a U-shaped valley. Enormous boulders, the size of a house, are dwarfed by the sheer faces of exfoliating granite, which rise 3000 feet (914 m) from the river. Through it all, the Merced river rushes down from its source in the High Sierra, and broadens on the floor of Yosemite valley.
A trail which links to the John Muir Trail starts after crossing from the Happy Isles. Depending on your conditioning, a bridge which re-crosses the river, the halfway point of a hike to the foot of Vernal Fall, can be reached in 15 to 30 minutes.
Hikers stop briefly just below the lower margin of the mist from Vernal FallTo the side of Vernal Fall, the mist from the river blankets the trail, which was improved during the WPA projects of the 1930s. Here is where raingear becomes handy: in the spring, hikers often become completely drenched from water sprayed off Vernal Fall. This is one of the few places where a complete circular rainbow can be viewed. The trail now crosses a sheer face which is made somewhat easier by a single guard rail. At the top of Vernal Fall, the Merced river traverses a shelf of granite, and the hikers frequently sun themselves to dry off.
The Emerald Pool is named for the color of the river here.
Up the trail, Nevada Falls, a waterfall that is over twice the height of Vernal Fall awaits the hiker, although there is no cascade of mist over the trail at that waterfall. Behind Nevada Falls is Liberty Cap, an impressive lump of granite. The Mist trail then rejoins the John Muir Trail: the hiker can travel in Little Yosemite Valley, or take a side trip to the top of Half Dome, using cables to climb the rock. Entry fee per car required. Source: Wikipedia
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