Located in Teller County, Colorado, the Mason dam, also known as Colorado Springs #4 or South Slope #4, is a crucial water supply infrastructure designed by BLACK AND VEATCH and completed in 1903. This earth dam on Boehmer Creek stands at a height of 50 feet and serves multiple purposes including water supply and creating a habitat for fish and wildlife. With a storage capacity of 3795 acre-feet and a normal storage of 1965 acre-feet, the dam covers a surface area of 109 acres and drains a 6-square mile watershed.

Managed by the local government and regulated by the Department of Water Resources, the Mason dam has a high hazard potential but is currently assessed as being in satisfactory condition. The dam features an uncontrolled spillway with a width of 42 feet and a maximum discharge capacity of 6235 cubic feet per second. Despite its age, the dam undergoes regular inspections, with the last one conducted in July 2020, to ensure its stability and safety for the surrounding community. Furthermore, the dam's risk assessment is classified as moderate, highlighting the importance of ongoing risk management measures to protect downstream areas in case of emergencies.