Holly, located in Arapahoe County, Colorado, serves as a critical flood risk reduction structure along Little Dry Creek. Built in 1979, this earth dam stands at a height of 40 feet and spans 1170 feet, providing a storage capacity of 455 acre-feet. Despite being classified with a high hazard potential, the dam's condition assessment was rated as satisfactory during the last inspection in November 2018.

Managed by local government authorities, Holly is regulated by the Colorado Department of Water Resources with state permitting, inspection, and enforcement in place. With a spillway width of 200 feet and uncontrolled spillway and outlet gates, this structure plays a vital role in mitigating flood risks for the surrounding area. While the dam's risk assessment is moderate, ongoing risk management measures are not explicitly documented.

For water resource and climate enthusiasts, Holly presents a fascinating case study in dam infrastructure and flood risk management. Its strategic location, design features, and regulatory oversight highlight the complex interplay between human interventions and natural forces in safeguarding communities against water-related hazards. As efforts continue to ensure the structure's safety and effectiveness, Holly stands as a testament to the ongoing challenges and opportunities in sustainable water resource management.