Alfred Lewis is a private irrigation dam located in Cornelius, Oregon, along Dairy Creek. Managed by the USDA NRCS, this earth dam stands at 20 feet in height and 755 feet in length, providing a storage capacity of 100 acre-feet for agricultural purposes. With a low hazard potential, the dam has a spillway width of 16 feet and a maximum discharge rate of 131 cubic feet per second.

While the dam's condition assessment is not available, it is regularly monitored for safety. Despite its small drainage area of 0.29 square miles, Alfred Lewis plays a crucial role in supporting water resource management in the region. With its strategic location and purpose, this dam serves as a vital component of the local irrigation infrastructure, ensuring a reliable water supply for agricultural activities in Marion County, Oregon. For water resource and climate enthusiasts, Alfred Lewis represents a fascinating blend of engineering ingenuity and environmental stewardship in maintaining a sustainable water supply system in the region.