Box Lake, located in Valley, Idaho, is a privately owned reservoir primarily used for irrigation purposes. Constructed in 1935 by AandE and USDA NRCS, this earth dam stands at a height of 13.1 feet and has a hydraulic height of 8.2 feet. With a storage capacity of 476 acre-feet and a surface area of 145 acres, Box Lake plays a crucial role in supporting agricultural activities in the region.

Despite being classified as having a low hazard potential, the dam is regularly inspected by the Idaho Department of Water Resources to ensure its fair condition and structural integrity. The spillway, which is uncontrolled and 10 feet wide, helps regulate the water levels in the reservoir. The surrounding area, with a drainage area of 0.8 square miles, is serviced by the Box Lake North Fork Payette River, emphasizing the interconnectedness of water resources in this region.

With its moderate risk assessment and the potential to enhance water management practices in the area, Box Lake serves as a vital resource for the local community and underscores the importance of sustainable water usage in the face of climate change challenges. The collaborative efforts of various agencies and designers involved in its construction and regulation highlight the commitment to preserving and maintaining this essential water infrastructure for future generations.