Gs Dd No 4-20c is a local government-owned earth dam located in Brown, Kansas, along Roy's Creek-TR. Constructed in 1989 by King & Associates, this dam serves the primary purpose of flood risk reduction in the area. With a height of 28 feet and a length of 510 feet, the dam has a NID storage capacity of 96.51 acre-feet, providing crucial protection for the surrounding community.

Although the hazard potential of Gs Dd No 4-20c is rated as low, the risk assessment indicates a moderate level of risk (3). Despite not being regulated or inspected by the state, this dam plays a vital role in mitigating potential flood damage in the region. With a spillway width of 71 feet and no outlet gates, the dam is designed to handle uncontrolled overflow events while maintaining structural integrity.

Even though the condition of Gs Dd No 4-20c is not rated, its risk management measures and emergency action plans are not specified. As a key component in the local flood risk reduction strategy, this dam exemplifies the importance of proactive infrastructure in safeguarding water resources and communities against the impacts of climate change.