Lee Valley, located in Apache County, Arizona, is a state-regulated irrigation dam on Rudd Creek that was completed in 1899. Owned and operated by the Arizona Department of Water Resources, this Earth-type dam stands at 20 feet in height and stretches 440 feet in length, with a storage capacity of 640 acre-feet. The dam serves the primary purpose of irrigation, with a maximum discharge capability of 600 cubic feet per second and a surface area of 44.8 acres.

With a significant hazard potential and a satisfactory condition assessment as of July 2017, Lee Valley is subject to regular inspections every three years to ensure its structural integrity. The dam's spillway is uncontrolled and has a width of 210 feet, allowing for the safe release of excess water during periods of high flow. Despite its age, Lee Valley continues to play a crucial role in water management and agricultural activities in the region, highlighting the importance of maintaining and monitoring our water resources in the face of changing climate patterns.