Harper Lake, located in Boulder, Colorado, is a vital water source managed by the local government for water supply purposes. This Earth dam, completed in 1985, stands at a height of 11 feet and has a storage capacity of 843 acre-feet, with a normal storage level of 715 acre-feet. The lake covers a surface area of 31 acres and is fed by Coal Creek-TR, providing essential resources for the surrounding area.

Despite its small size, Harper Lake plays a crucial role in the region's water management, with a maximum discharge capacity of 460 cubic feet per second and an uncontrolled spillway width of 8 feet. The dam has a satisfactory condition assessment as of September 2020, with a high hazard potential due to its location. The emergency action plan is in place, but its last revision was in 2018, necessitating regular updates to ensure preparedness for any potential risks or emergencies that may arise.

Harper Lake serves as a prime example of efficient water resource management in Colorado, highlighting the importance of monitoring and maintaining infrastructure to ensure the safety and sustainability of water supplies in the face of changing climate conditions. The dedication of local government agencies, in conjunction with regulatory oversight from the state, underscores the commitment to safeguarding this valuable resource for future generations of residents and wildlife in the area.