Crystal is a private dam located in Boulder, Colorado, along the St. Vrain Creek. Built in 1881, this earth dam stands at a height of 11 feet and has a length of 1140 feet, providing a storage capacity of 290 acre-feet. While its primary purpose is for recreation, Crystal also serves functions such as fire protection, irrigation, and stock or small fish pond support.

Maintained by the Colorado Department of Water Resources, Crystal is regulated and inspected regularly to ensure its structural integrity and safety. With a low hazard potential and a satisfactory condition assessment, this dam poses a moderate risk, reflecting the importance of ongoing risk management measures. In the event of an emergency, the dam is equipped with an uncontrolled spillway and has designated emergency contacts updated periodically.

For water resource and climate enthusiasts, Crystal presents an intriguing case study of a historic dam that continues to play a vital role in the local water infrastructure. From its construction in the late 19th century to its modern-day management practices, this dam offers insights into the intersection of water management, recreation, and environmental stewardship in the region. As the climate changes and water resources become increasingly important, understanding the maintenance and regulation of structures like Crystal is crucial for ensuring the safety and sustainability of our water systems.