Gaynor is a significant earth dam located in Longmont, Colorado, along the Boulder Creek. Owned by the local government, this dam serves primarily for irrigation purposes, with additional benefits for recreation. With a height of 10 feet and a storage capacity of 840 acre-feet, Gaynor plays a crucial role in water resource management in the area.

The dam has a spillway width of 74 feet and a maximum discharge capacity of 807 cubic feet per second, making it a vital infrastructure for flood control and water release during peak flow periods. Despite its significant hazard potential, the dam is currently in satisfactory condition, as assessed during the last inspection in October 2020. The risk assessment for Gaynor is moderate, indicating the importance of ongoing monitoring and maintenance to ensure its continued safety and functionality.

With its strategic location and key role in water management, Gaynor represents a vital piece of infrastructure in the region. Climate and water resource enthusiasts will find interest in the dam's design and operational details, as well as its importance in safeguarding the surrounding community from potential flood risks.