<Li> Phantom Ranch: David Rust, Mary Colter </Li> <Li> Grand Canyon Village: Ralph H. Cameron, Emery & Ellsworth Kolb </Li> <P> U.S. President Theodore Roosevelt visited the Grand Canyon in 1903 . An avid outdoorsman and staunch conservationist, Roosevelt established the Grand Canyon Game Preserve on November 28, 1906 . Livestock grazing was reduced, but predators such as mountain lions, eagles, and wolves were eradicated . Roosevelt along with other members of his conservation group, the Boone and Crockett Club helped form the National Parks Association, which in turn lobbied for the Antiquities Act of 1906 which gave Roosevelt the power to create national monuments . Once the act was passed, Roosevelt immediately added adjacent national forest lands and redesignated the preserve a U.S. National Monument on January 11, 1908 . Opponents such as land and mining claim holders blocked efforts to reclassify the monument as a U.S. National Park for 11 years . Grand Canyon National Park was finally established as the 17th U.S. National Park by an Act of Congress signed into law by President Woodrow Wilson on February 26, 1919 . </P> <P> The federal government administrators who manage park resources face many challenges . These include issues related to the recent reintroduction into the wild of the highly endangered California condor, air tour overflight noise levels, water rights disputes with various tribal reservations that border the park, and forest fire management . Federal officials started a flood in the Grand Canyon in hopes of restoring its ecosystem on March 5, 2008 . The canyon's ecosystem was permanently changed after the construction of the Glen Canyon Dam in 1963 . </P>

When did grand canyon become a national park