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alpine, america, ca, california, concrete, construction, dam, drinking, energy, engineering, floodgate, flow, flowing, hetch hetchy reservoir, hydro, hydroelectric, industry, lake, landmark, landscape, large, mountains, nature, oshaughnessy dam, outdoors, overflow, park, popular, power, reservoir, river, runoff, rushing, scenery, scenic, sierra, snowmelt, structure, supply, technology, tuolumne river, united states, usa, valley, view, wall, water, water system, yosemite, yosemite national park,