be an issue in the 21st century. The Army's administration of the park ended in 1914. Galen Clark retired as the state grant's guardian in 1896, leaving Yosemite Valley and the Mariposa Grove of Big Trees under ineffective stewardship. Pre-existing problems in the state grant worsened and new problems arose, but the cavalry could only monitor the situation. Muir and the Sierra Club continued to lobby the government and influential people for the creation of a unified Yosemite National Park. The Sierra Club began to organize annual trips to Yosemite in 1901 in an effort to make the remote area more accessible. Unified national park U.S. President Theodore Roosevelt camped with John Muir near Glacier Point for three days in May 1903. During that trip, Muir convinced Roosevelt to take control of the valley and the grove away from California and give it to the federal government. On June 11, 1906, Roosevelt signed a bill that did precisely that, and the superintendent's headquarters was moved from Wawona to Yosemite Valley. To secure congressional and State of California approval for the plan, the size of the park was reduced by more than , which excluded natural wonders such as the Devils Postpile and prime wildlife habitat. The park was again reduced in size in 1906, when logging began in an area around Wawona. Acting superintendent Major H. C. Benson said in 1908 that "game is on the decrease. Each reduction of the park has cut another portion of the winter resort of game." The various changes meant that the park was reduced to two-thirds of its original size. About between the Tuolumne and the Merced big tree groves were added to the park in 1930 through land purchases by the federal government and matching funds provided by industrialist John D. Rockefeller. Another near Wawona were added in 1932. The Carl Inn Tract, close to the Rockefeller purchase, was secured in 1937 and 1939. Fight over Hetch Hetchy Valley San Francisco Mayor James D. Phelan hired USGS engineer Joseph P. Lippincott in 1900 to perform a discreet survey of Hetch Hetchy Valley, located north of Yosemite Valley in the national park. His report stated that a dam of the Tuolumne River in the Hetch Hetchy Valley was the best choice to create a drinking water reservoir for the city. Lippincott sought water rights to the Tuolumne River and rights to build reservoirs