Mountain Supply # 9, located in Larimer, Colorado, is a privately owned irrigation dam completed in 1907 on the N. Fork Cache La Poudre River. This Earth dam stands at a height of 24 feet and has a maximum storage capacity of 413 acre-feet on its 57-acre surface area. With a low hazard potential and a satisfactory condition assessment as of August 2020, this dam plays a crucial role in water resource management in the region.

Managed by the Colorado Department of Water Resources, Mountain Supply # 9 serves the primary purpose of irrigation, supporting agricultural activities in the area. With a spillway width of 200 feet and a maximum discharge capacity of 14,200 cubic feet per second, this dam ensures controlled water release during peak flow events. Despite its age, regular inspections are conducted, with the last one taking place in August 2020, ensuring its continued safe operation for the community.

Located just 6 miles from Fort Collins, Mountain Supply # 9 is not only a vital water supply structure but also a part of the rich history of water resource management in Colorado. With a moderate risk assessment rating, this dam highlights the importance of ongoing monitoring and maintenance practices to ensure its long-term functionality and safety for both the environment and the surrounding community.