Gatfield No 1, also known as Gatfield Lower Dam, is a privately owned structure located in Gem County, Idaho. Completed in 1938, this earth dam stands at a height of 16.2 feet and has a hydraulic height of 13.3 feet. It serves as a crucial resource for water management in the area, with a normal storage capacity of 14 acre-feet and a drainage area of 0.5 square miles, primarily impacting Rock Creek and the Payette River.

Despite its age, Gatfield No 1 has been consistently regulated and inspected by the Idaho Department of Water Resources, ensuring its structural integrity and safety. The dam has a fair condition assessment and is classified as having a significant hazard potential, with a moderate risk level. With a spillway width of 9 feet and a maximum discharge capacity of 26 cubic feet per second, the dam plays a vital role in flood control and water storage in the region, contributing to the overall water resource management efforts.

As a key component of the water infrastructure in the area, Gatfield No 1 continues to be an important structure for water resource enthusiasts and climate advocates alike. Its history, design, and impact on the surrounding environment make it a fascinating subject for those interested in the intersection of water management, engineering, and environmental sustainability. The ongoing maintenance and regulatory oversight of Gatfield No 1 reflect a commitment to preserving and enhancing water resources for future generations, highlighting the importance of responsible stewardship of our natural resources.