Summitville Tailings, also known as Cleveland-Cliffs Tailings Pond, is a state-owned water supply structure located in Capulin, Colorado. Built in 1968, this earth dam stands at a height of 80 feet and spans a length of 675 feet, with a maximum storage capacity of 450 acre-feet. Situated along the Wightman Fork river, the dam serves as a vital resource for water supply purposes in the Rio Grande County.

Despite its low hazard potential and satisfactory condition assessment, Summitville Tailings is subject to state regulation, inspection, and enforcement to ensure its operational integrity. Equipped with slide gates for outlet control, the dam features an uncontrolled spillway with a width of 61 feet. With a drainage area of 4 square miles and a maximum discharge rate of 5940 cubic feet per second, the dam plays a crucial role in managing water resources in the region.

While categorized as having a moderate risk level, Summitville Tailings remains a key component of Colorado's water infrastructure. The dam's compliance with state permitting and inspection requirements, as well as its strategic location within the Sacramento District, highlights its importance in safeguarding water resources and mitigating potential climate-related risks in the area.