Melvern Waterfowl Marsh Dam #1 in Osage, Kansas, is a state-owned structure designed for Fish and Wildlife Pond purposes, providing a habitat for various waterfowl species. The dam, primarily made of earth with a buttress core type, stands at a height of 14 feet and stretches out for 380 feet, creating a surface area of 4.1 acres and a maximum storage capacity of 52.4 acre-feet. Situated along the Marais Des Cygnes River, the dam serves as a recreational spot for enthusiasts of water resources and climate, offering opportunities for wildlife observation and outdoor activities.

Managed by the Kansas Department of State, Melvern Waterfowl Marsh Dam #1 holds a low hazard potential with a condition assessment of "Not Rated." Although not currently regulated or inspected by state agencies, the dam's emergency action plan status and risk assessment are unknown. With a designated spillway width of 43 feet and no outlet gates, the dam's primary function is to maintain a sustainable environment for fish and wildlife while also catering to recreational interests. While lacking detailed information on its construction and maintenance history, the dam remains a significant feature in the conservation and preservation efforts within the region.

As part of the Tulsa District under the US Army Corps of Engineers, Melvern Waterfowl Marsh Dam #1 contributes to the ecological balance of the area by providing essential water resources for wildlife and recreational activities. The dam's strategic location along the Marais Des Cygnes River enhances the biodiversity of the region and offers a serene setting for nature enthusiasts to appreciate the beauty of the surrounding landscape. Despite limited information on its operational aspects, the dam's role in supporting the local ecosystem underscores the importance of sustainable water management practices in mitigating the impacts of climate change on aquatic habitats.