Sedimentation Pond Hg-1, located in Hamilton, Colorado, is a privately owned structure designed for flood risk reduction along the Hayden Gulch river. Completed in 1979, this earth dam stands at a height of 40 feet with a hydraulic height of 50 feet, serving the primary purpose of flood control. With a maximum storage capacity of 44 acre-feet and a normal storage of 25 acre-feet, Sedimentation Pond Hg-1 covers a surface area of 3 acres and has a maximum discharge capacity of 1090 cubic feet per second.

Despite being rated as having a low hazard potential, Sedimentation Pond Hg-1 has a high risk assessment score of 2 due to its location and potential impact on the surrounding area. The structure has not been recently inspected since January 1991, with an inspection frequency of every 6 years. The condition assessment is currently listed as "Not Rated," and there is no emergency action plan (EAP) in place for this dam. With the risk management measures and inundation maps not yet prepared, there is a need for updated assessments and emergency planning to ensure the safety and efficiency of Sedimentation Pond Hg-1 in the face of potential climate challenges and water resource management issues.