Frd No 43, also known as Upper Black Vermillion WS Dam 43, is a flood risk reduction structure located in Vermillion, Kansas. Owned by the local government and designed by USDA NRCS, this earth dam stands 31 feet tall and serves the primary purpose of flood risk reduction along the Black Vermillion River. Completed in 1972, the dam has a storage capacity of 356.2 acre-feet and covers a surface area of 9.04 acres, with a drainage area of 0.67 square miles.

With a low hazard potential and a moderate risk assessment rating, Frd No 43 is regulated by the Kansas Department of Agriculture and undergoes regular inspections and enforcement. The dam features an uncontrolled spillway and has no outlet gates, with a condition assessment that is currently not rated. While the structure has not been modified in recent years, it continues to serve as a vital component of the local water resource management system, ensuring the safety and protection of surrounding communities in the event of flooding.

Situated in Nemaha County, Frd No 43 is a key part of the flood risk reduction infrastructure in the region, providing essential protection against potential inundation. With a history of effective operation and maintenance, this dam exemplifies the collaborative efforts between local and federal agencies to safeguard water resources and mitigate the impacts of climate-related events. As water resource and climate enthusiasts, it is important to recognize the significance of structures like Frd No 43 in maintaining the resilience and sustainability of our natural environment.