Willow Lake, located in Johnson County, Kansas, is a privately owned structure designed by the USDA NRCS, with a primary purpose of serving as a fire protection, stock, or small fish pond. Completed in 1960, this earth dam stands at a height of 28 feet and spans a length of 850 feet, with a storage capacity of 136.5 acre-feet. The dam is regulated by the Kansas Department of Agriculture and undergoes regular inspections to ensure its safety and functionality.

With a high hazard potential and an unsatisfactory condition assessment, Willow Lake poses a moderate risk that necessitates careful monitoring and management. The spillway, with a width of 94 feet, is uncontrolled, and the dam lacks outlet gates for water release. Despite these challenges, the dam continues to provide essential services for debris control, fire protection, and water storage in the area. The surrounding Blue River-TR watershed benefits from the lake's presence, supporting the local ecosystem and water resources in the region.

As climate change impacts water resources and infrastructure, the resilience and maintenance of structures like Willow Lake become increasingly vital. With its historical significance and ongoing role in serving the community, Willow Lake stands as a testament to the importance of sustainable water management practices. Through continued monitoring, risk assessment, and potential upgrades, Willow Lake can adapt to changing conditions and continue to fulfill its critical functions for the environment and stakeholders in the region.