South Junction is a privately-owned irrigation structure located in Box Elder, Utah, specifically in the city of Lynn. Managed by the Utah Division of Water Rights, this dam on South Junction Creek was completed in 1958 and serves the primary purpose of irrigation. With a height of 47 feet and a hydraulic height of 44 feet, it has a storage capacity of 865 acre-feet, making it a significant water resource in the area.

Designed by the USDA NRCS, South Junction is regulated, permitted, inspected, and enforced by the state of Utah, ensuring its safety and compliance with water management regulations. The dam is situated in a strategic location with a drainage area of 6.2 square miles, providing vital water supply for agricultural activities in the region. Despite being marked as having a significant hazard potential, its condition assessment is currently not rated, highlighting the need for further evaluation and potential risk management measures.

Located within the Sacramento District, South Junction plays a crucial role in water resource management and climate adaptation efforts in the area. With its historical significance dating back to the mid-20th century, this earth dam stands as a testament to the importance of sustainable water infrastructure for supporting agriculture and local communities. As water enthusiasts and climate advocates continue to monitor and assess the dam's condition, it remains a focal point for ensuring water security and resilience in the face of changing environmental conditions.