Fairchild No. 1 (Upper), also known as Upper Fairchild Dam, is a privately owned structure located in Midvale, Idaho. Completed in 1975, this earth dam stands at a height of 77.5 feet and serves the primary purpose of irrigation in the region. With a maximum storage capacity of 3,303 acre-feet and a surface area of 111.3 acres, it plays a crucial role in water resource management for the surrounding area.

Situated on an unnamed stream in Sage Creek, Fairchild No. 1 (Upper) is regulated by the Idaho Department of Water Resources and undergoes regular inspections to ensure its functionality and safety. The dam has a high hazard potential and a fair condition assessment, with a moderate risk level of 3. It features an uncontrolled spillway with a width of 24 feet and slide gates for outlet control, highlighting its importance in managing water flow and preventing potential flooding.

Overall, Fairchild No. 1 (Upper) is a significant component of the water infrastructure in Washington County, Idaho, contributing to irrigation efforts and water storage in the region. With its critical role in water resource management, ongoing inspections, and regulatory oversight, this dam plays a vital role in supporting agricultural activities and maintaining water security for the local community.