Pedzisa mutsara unotevera: Kunyange zvazvo San Francisco yakanga yatsvaka mvura yeRwizi rweTuolumne muma1890, chirongwa ichi hachina kufambira mberi kutozosvikira
kudengenyeka kwenyika uye moto zva1906, izvo zvakasimbisa kusakwana kwegadziriro iripo yemvura. Hetch Hetchy Valley <unk> yakazoenzaniswa neYosemite Valley nokuda kworunako rwayo rwakanaka <unk> yakasarudzwa nokuda kwounhu hwayo hwemvura uye simba remagetsi, asi nzvimbo yacho mukati memunda wenyika yakakonzera kukakavadzana. Mutemo weCongress waidikanwa kuti udzivise kudzivirirwa kwehurumende kwerwizi rweTuolumne, nechikonzero chokuti nyika yeruzhinji inofanira kuvandudzwa nokuda kwebetsero yeruzhinji.