Duke Lake, located in Jefferson County, Colorado, is a privately owned dam with a primary purpose of water supply. Completed in 1972, this Earth-type dam stands at 34 feet high and spans a length of 1024 feet, with a storage capacity of 375 acre-feet. The lake's normal storage capacity is 295 acre-feet, covering a surface area of 12 acres.

Despite being classified as having a low hazard potential and a satisfactory condition assessment, Duke Lake is subject to state regulation, inspection, and enforcement. The dam's spillway is uncontrolled with a width of 29 feet, capable of handling a maximum discharge of 820 cubic feet per second. The last inspection was conducted in September 2016, with an inspection frequency of every six years.

For water resource and climate enthusiasts, Duke Lake offers a fascinating example of a man-made structure playing a crucial role in water supply management. Its location along Clear Creek-OS, in the city of Wheatridge, provides a serene setting for studying the intersection of human engineering and natural water systems. With its moderate risk assessment and state-mandated oversight, Duke Lake showcases the importance of responsible dam operation and maintenance in ensuring the safety and sustainability of water resources in the region.