Monroe is a private-owned dam located in Washington, Idaho, built in 1916 with a primary purpose of irrigation. Situated along Jenkins Creek and the Snake River, Monroe serves as a crucial water resource for the region, with a storage capacity of 272 acre-feet and a surface area of 20 acres. The dam stands at a height of 36.2 feet and has a hydraulic height of 34 feet, making it a vital infrastructure for agricultural purposes in the area.

Despite being classified as having a low hazard potential and fair condition assessment, Monroe's risk assessment is moderate, signaling the need for ongoing monitoring and maintenance. The dam features a multi-arch masonry design and an uncontrolled spillway type with a width of 12 feet. With the dam being regulated, inspected, and permitted by the Idaho Department of Water Resources, it plays a critical role in ensuring water security and supply for the surrounding communities. Overall, Monroe stands as a testament to the intersection of water resource management, climate resilience, and agricultural sustainability in the region.