Alarm over the nation's disappearing natural landscape spurred the parks movement, and Richard Lieber and others advocated creation of a state park system as Indiana's 1916 centennial gift. McCormick's Creek was purchased in time for the centennial celebration after land for Turkey Run was lost at auction to a higher bidder, but Lieber's group bought Turkey Run within the year. By 1932, ten parks dotted the state. Inns provided accommodations for early visitors, many of whom stayed more than a week, and gatehouses reflected Indiana State Parks' leadership in using a user-pays model to support operating costs. Almost from the beginning, nature guides interpreted the parks' natural and cultural stories. During the Great Depression, the Civilian Conservation Corps put jobless young men to work constructing buildings, trail systems, and infrastructure in the parks. After World War II, veterans earned college degrees, entered the workforce, started families, and rising incomes increased travel and demand for parks. Beginning in the 1950s, the U.S. Army Corps of Engineers built dams for flood control, and land was managed for camping, hunting, and fishing by the Division of Reservoir Management, which later merged with State Parks. In the 1960s, growing environmental concern led State Parks to adopt practices to conserve and maintain valuable ecosystems, and the system continued as a leader in conservation and management into its second century.