Eagle Creek Park and its large man-made reservoir inside city limits

Eagle Creek Park encompasses roughly 3,900 acres within Indianapolis and includes the Eagle Creek Reservoir, a large man-made reservoir created by dam construction in the 1960s for flood control and water supply. The presence of such a sizable reservoir and park within the city's boundaries is frequently noted as unusual for a major U.S. city. The reservoir is used for recreation, wildlife habitat, and municipal water management, distinct from the natural White River channel.