Million Dollar, also known as Plum Creek Golf Course, is a privately owned dam located in Castle Rock, Colorado. Completed in 1984, this earth dam stands at a height of 10 feet and has a length of 1600 feet, providing recreational benefits in the form of a surface area of 6 acres and a storage capacity of 61 acre-feet. The dam, situated on the E. Plum Creek-OS river or stream, is under the regulatory jurisdiction of the Colorado Department of Water Resources, ensuring state-mandated inspections, permitting, and enforcement.

Despite being classified as having a significant hazard potential, Million Dollar Dam is rated as being in fair condition as of its last assessment in June 2019. With a moderate risk rating, the dam has an established emergency action plan and meets regulatory guidelines for risk management. The dam's spillway, an uncontrolled type with a width of 102 feet, is designed to handle a maximum discharge of 710 cubic feet per second, safeguarding downstream areas in the event of overflow. The dam is an essential part of the local recreational landscape, offering both leisure activities and water resource management in Douglas County, Colorado.