Pre-World War I
Charleston cruised to South American ports in the summer of 1906 with Secretary of State Elihu Root on board for good-will visits, and after disembarking the official party at Panama in September, returned to the west coast for overhaul. She cleared San Francisco on 6 December 1906 to begin service with the Pacific Squadron, sailing along the west coast from Magdalena Bay, Mexico, to Esquimalt, British Columbia, on exercises and fleet maneuvers until 10 June 1908, when she entered the Puget Sound Navy Yard to prepare for the long passage to the Asiatic Squadron.[4] During this time, Charleston stopped in Portland, Oregon in June 1907 for the annual Portland Rose Festival. Charleston was the first U.S. Navy ship to attend the event, a tradition the Navy continues participate in to this day.[5]
Leaving Puget Sound on 28 October 1908, Charleston served in the Far East until 11 September 1910, first as flagship of 3rd Squadron, Pacific Fleet, and later, as flagship of the Asiatic Fleet. Based on Cavite, Philippines in the winter, the Fleet moved north each summer to Chefoo, China, to continue exercises and visits to ports of China, Japan, Manchuria, and Russia, presenting a powerful reminder of American interest in the Far East. Returning to Bremerton, Washington, Charleston was decommissioned on 8 October 1910 at Puget Sound.[4]
Placed in commission in reserve on 14 September 1912, Charleston joined the Pacific Reserve Fleet, remaining at Puget Sound as a receiving ship through early 1916, aside from a voyage to San Francisco in October 1913 as flagship for the Commander-in-Chief, Pacific Reserve Fleet. From 1912 through early 1916, she was receiving ship at the yard. With a new assignment as tender for the submarines based in the Panama Canal Zone, Charleston arrived at Cristobal, C.Z. on 7 May 1916, for a year of operations with submarines, reconnaissance of anchorages, and gunnery exercises.