Frd No 40, also known as Big Caney WS Dam 40, is a vital water resource structure located in Grenola, Kansas. Built in 1968 by the USDA NRCS, this earth dam stands at a height of 41 feet, with a hydraulic height of 38 feet and a length of 1580 feet. It serves the primary purpose of flood risk reduction along the East Fork Caney River-TR, with a normal storage capacity of 91 acre-feet and a maximum storage of 855.57 acre-feet.

Owned by the local government and regulated by the Kansas Department of Agriculture, Frd No 40 is deemed to have a low hazard potential and a moderate risk assessment. With a spillway width of 40 feet and a maximum discharge of 320 cubic feet per second, this dam plays a crucial role in managing water flow and reducing flood risks in the region. Despite being unlisted in terms of condition assessment, Frd No 40 remains a key infrastructure for water resource management in Elk County, Kansas.

As a significant contributor to water resource management in the area, Frd No 40 is a valuable asset for climate enthusiasts and water resource professionals alike. Its construction by the Natural Resources Conservation Service and its continued operation under state jurisdiction highlight the collaborative efforts to ensure the safety and efficiency of water infrastructure in Kansas. With a focus on flood risk reduction and a history dating back to 1968, Frd No 40 stands as a testament to the importance of sustainable water management practices in the face of changing climate patterns.