Arcadia Lower, located in Fremont, Idaho, is a privately-owned irrigation structure completed in 1912. This earth dam, primarily constructed for irrigation purposes, stands at a height of 22.7 feet and has a hydraulic height of 18.8 feet. With a normal storage capacity of 882 acre-feet and a surface area of 68 acres, it serves the surrounding agricultural community by providing water from Pine Creek and Sand Creek. Despite being categorized as having low hazard potential, the dam is assessed to be in fair condition as of the last inspection in April 2017.

Managed by the Idaho Department of Water Resources, Arcadia Lower is regulated and permitted by the state agency. It undergoes regular inspections every 5 years to ensure its structural integrity and safety. The dam features an uncontrolled spillway, slide gates for outlet control, and is situated in a moderate risk area, according to the risk assessment conducted. Overall, Arcadia Lower plays a crucial role in the local water resource management and contributes significantly to the irrigation needs of the region.

For water resource and climate enthusiasts, Arcadia Lower presents a fascinating case study of a historic irrigation structure in Idaho. Its design and construction, dating back over a century, showcase the engineering ingenuity of the time in harnessing water from multiple sources for agricultural use. The dam's presence not only highlights the importance of water management in arid regions but also serves as a reminder of the ongoing efforts required to maintain and monitor aging infrastructure to ensure the safety and sustainability of water resources in the face of changing climatic conditions.