Stock photography, photos: Merced River tumbles over boulders Stock photos of Headwaters of the Merced River in Yosemite National Park. Shot taken with large format 4x5 and Fuji Velvia transparency film Photograph: © Lon Overacker Click for a larger image and more information Keywords associated with this stock photo: water, river, rushing water, waterfall, national park, yosemite, happy isles, silky water, smooth, soothing, large format, cascade, cascading, nature, water flow, flow, flowing, merced, merced river