Deer Flat Upper is a crucial water resource in Idaho, owned and regulated by the Bureau of Reclamation. Completed in 1907, this earth dam stands at a height of 74 feet and has a maximum storage capacity of 159,365 acre-feet for irrigation purposes. Situated on the Boise River, this structure plays a vital role in providing water for agricultural activities in Canyon County.

With a hazard potential classified as high, Deer Flat Upper has undergone structural modifications in 1994 and 2009 to ensure its safety and functionality. The dam's spillway, with a width of 950 feet, helps manage excess water flow during periods of high discharge. Despite its age, Deer Flat Upper continues to be maintained by the Bureau of Reclamation, with regular inspections ensuring its structural integrity and compliance with regulatory standards.

Water and climate enthusiasts will appreciate the historical significance and engineering marvel of Deer Flat Upper, situated in the picturesque city of Caldwell, Idaho. This structure not only serves as a vital component of the region's irrigation system but also showcases the importance of sustainable water resource management in the face of changing climatic conditions.