Big Sandy Creek Watershed S-12, also known as Boys Ranch, is a key flood risk reduction structure located in El Paso County, Colorado. Constructed in 1959 by the USDA NRCS, this earth dam stands at a height of 32 feet and has a structural height of 37 feet, with a length of 2153 feet. The dam has a normal storage capacity of 260 acre-feet and a maximum storage of 440 acre-feet, serving to protect the surrounding area from potential flooding events.

Managed by the local government and regulated by the Colorado Division of Water Resources, Big Sandy Creek Watershed S-12 has a low hazard potential and a satisfactory condition assessment. With a moderate risk assessment rating, the dam is inspected every three years to ensure its continued functionality and safety. The dam's spillway type is uncontrolled, with a width of 150 feet, and it is designed to handle a maximum discharge of 2377 cubic feet per second, providing crucial flood protection for the Big Sandy Creek-TR watershed.

Located in the city of Ramah, Colorado, Big Sandy Creek Watershed S-12 plays a vital role in managing water resources and mitigating flood risks in the region. As a significant infrastructure project designed for flood risk reduction, this earth dam stands as a testament to the collaborative efforts between local agencies and the USDA NRCS to safeguard communities and ecosystems in the Big Sandy Creek watershed.