Flagstone is a federal-owned dam located in Washakie, Wyoming, with a primary purpose of providing fire protection, stock, or a small fish pond. Built in 1965 by designer Walter J Pilch, the dam is an earth structure with a core made of stone and a foundation of soil. Standing at a height of 27 feet and spanning 248 feet in length, Flagstone has a storage capacity of 48 acre-feet and a surface area of 4 acres.

Despite being categorized as having a low hazard potential and fair condition assessment, Flagstone is regulated and inspected by the State of Wyoming to ensure its safety and compliance. The dam is equipped with an uncontrolled spillway, with a spillway width of 30 feet. Although the drainage area associated with the dam is listed as 0, the dam serves as a crucial resource for water management and agricultural purposes in the region. As climate change continues to impact water resources, the management and upkeep of dams like Flagstone become increasingly important for sustainable water use and environmental protection.

In the event of an emergency, the dam has protocols in place for risk management and emergency response, with inspections occurring every 5 years to assess its condition and readiness. With its moderate risk assessment and location in an area prone to natural disasters, Flagstone serves as a vital infrastructure for water supply and ecosystem support, highlighting the intersection of water resource management and climate resilience in the face of changing environmental conditions.