Unimin Tailings Pond O Dam, also known as Pond 137, is a private-owned structure located in North Utica, Illinois. Built in 2010 by TRIAD ENGINEERING, INC., this earth-type dam stands at a height of 56 feet and has a length of 924 feet. With a storage capacity of 650 acre-feet, the dam primarily serves the purpose of containing tailings from mining operations.

Despite being categorized as having a low hazard potential, the dam is subject to state regulation and inspection by the Illinois Department of Natural Resources. The spillway type is uncontrolled, with a width of 2 feet. The dam's drainage area is 0.07 square miles, with a surface area of 33.8 acres. While the risk assessment indicates a moderate level of risk, specific risk management measures and emergency action plans are not readily available.

Overall, Unimin Tailings Pond O Dam plays a crucial role in managing mining byproducts and ensuring environmental safety in the area. Its structural integrity and regulatory oversight are essential for maintaining the dam's functionality and preventing any potential hazards to the surrounding community and ecosystem. Climate and water resource enthusiasts would find this dam's design and management details intriguing in the context of sustainable resource utilization and environmental protection.