Big Sandy Creek Watershed S-19, also known as Cain, is a crucial flood risk reduction structure located in Matheson, Elbert County, Colorado. Constructed in 1959 by the USDA NRCS, this earth dam stands at a height of 30 feet and has a structural height of 36 feet, with a length of 1107 feet. With a normal storage capacity of 185 acre-feet and a maximum discharge of 1628 cubic feet per second, this dam plays a vital role in managing the flow of Big Sandy Creek-TR.

Despite its age, Big Sandy Creek Watershed S-19 is in satisfactory condition with a low hazard potential. The dam underwent its last inspection in October 2020 and is regulated, permitted, inspected, and enforced by the Colorado Division of Water Resources. While the risk assessment for this structure is moderate, the emergency action plan status, inundation maps, and risk management measures are not specified in the available data. Overall, Big Sandy Creek Watershed S-19 serves as a reliable asset for flood risk reduction in the area, providing essential protection for the surrounding communities and ecosystems.