Patterson Lake Dam, located in Winthrop, Washington, was completed in 1924 and serves as a vital water supply source for the surrounding area. Managed by the Washington Dept of Ecology, this earth dam stands at a hydraulic height of 32 feet and has a storage capacity of 4100 acre-feet, with a normal storage level of 2500 acre-feet. The dam also supports irrigation and recreation activities, making it a multifunctional asset for the community.

Despite its age, Patterson Lake Dam is deemed to be in fair condition with a high hazard potential, indicating the need for regular inspections and maintenance to ensure its continued safety and functionality. The dam is situated on Rader Creek and has a drainage area of 6.03 square miles, with a maximum discharge capacity of 260 cubic feet per second. With its stone core and rock-and-soil foundations, the dam plays a crucial role in managing water resources in the region, highlighting its importance in the face of changing climate patterns.

As a key infrastructure for water management in Okanogan County, Patterson Lake Dam's presence underscores the interconnectedness of water resources and climate resilience. With its historical significance and ongoing regulatory oversight, the dam represents a critical piece of the region's water supply infrastructure, showcasing the importance of sustainable water management practices in the face of evolving environmental challenges.