Mill #4 Tailings #1 Dam, located in Eureka, Nevada, is a privately owned earth dam built in 1989 primarily for tailings storage. Standing at a height of 182 feet with a hydraulic height of 179 feet, this dam serves the purpose of storing 4878 acre-feet of water with a surface area of 30 acres. Situated on Rodeo Creek-OS, the dam has a drainage area of 0.1 square miles and a maximum discharge capacity of 5 cubic feet per second.

Despite being categorized as having a significant hazard potential and a high risk level, Mill #4 Tailings #1 Dam has not received a condition assessment rating. The dam has undergone structural modifications in 1991 and is inspected every 3 years, with the last inspection conducted in May 2020. The dam does not have a spillway and relies on a single other controlled outlet gate. The emergency action plan status and adherence to guidelines remain unspecified, highlighting potential areas for improvement in risk management and emergency preparedness.

With its unique design features and critical role in tailings storage, Mill #4 Tailings #1 Dam presents an interesting case study for water resource and climate enthusiasts. The dam's location, size, and risk profile offer valuable insights into the challenges and considerations involved in managing water resources in semi-arid regions like Nevada. As efforts continue to ensure the safety and sustainability of dams across the state, the story of Mill #4 Tailings #1 Dam serves as a reminder of the importance of proactive monitoring, assessment, and risk mitigation strategies in safeguarding our water infrastructure in the face of changing climate conditions.