Frd No 43, also known as Elk River WS Joint District No 47, is a local government-owned earth dam located in Elk Falls, Kansas. Completed in 1977, this dam serves the primary purpose of flood risk reduction along the Mound Branch Elk River. With a height of 43 feet and a length of 1900 feet, Frd No 43 has a storage capacity of 1539.7 acre-feet and a normal storage of 132.7 acre-feet, covering a surface area of 26.3 acres and draining an area of 3.3 square miles.

Managed by the Kansas City District of the US Army Corps of Engineers, Frd No 43 has a low hazard potential and is currently rated as "Not Rated" in terms of condition assessment. Despite its moderate risk level, this dam has not been inspected since November 2003, with an unknown inspection frequency. The dam features an uncontrolled spillway with a width of 120120 feet and lacks outlet gates and associated structures. With its location at 24,30S, 9E and under the jurisdiction of the Kansas Department of Agriculture, Frd No 43 plays a crucial role in mitigating flood risks in the Elk River watershed.