Noonen, located in Colorado along Muddy Creek, is a privately owned irrigation dam designed by USDA NRCS in 1907. With a height of 24 feet and a hydraulic height of 42 feet, the dam serves multiple purposes including fire protection, stock maintenance, irrigation, and recreation. It has a storage capacity of 2640 acre-feet and covers a surface area of 160 acres, with a maximum discharge capacity of 7057 cubic feet per second.

The dam's spillway, measuring 242 feet wide, is of the controlled type, ensuring efficient water management. Despite its age, the dam has been assessed to be in satisfactory condition and has a low hazard potential. Regular inspections are conducted to ensure its safety, with the last assessment in March 2020. The risk assessment for Noonen is deemed to be very high, emphasizing the importance of risk management measures to protect the surrounding area from potential inundation.

Overall, Noonen stands as a vital water resource in Arapahoe County, Colorado, contributing to the region's agricultural and recreational needs. Its historical significance and ongoing role in water management highlight the importance of continued monitoring and maintenance to ensure the safety and sustainability of this essential infrastructure.