Ls Mcmaster 4592, also known as Mcmaster SWS, is a grade stabilization structure located in Turin, Iowa, along the Tr- Little Sioux River. Owned by the local government, this earth dam was designed by the USDA NRCS and completed in 1955. With a height of 33 feet and a storage capacity of 15 acre-feet, this structure serves the primary purpose of grade stabilization in the area.

Managed and funded by the Natural Resources Conservation Service, Ls Mcmaster 4592 has a low hazard potential and a moderate risk assessment rating. The spillway type is uncontrolled, with a width of 20 feet, and the dam is primarily made of stone on a soil foundation. While the structure has not been modified in recent years, it plays a crucial role in managing water resources and mitigating potential risks in the region.

For water resource and climate enthusiasts, Ls Mcmaster 4592 stands as a testament to the ongoing efforts to maintain and improve infrastructure for sustainable water management. As a vital component in the local watershed, this structure highlights the importance of collaboration between government agencies and the community to ensure the resilience of water resources in the face of changing climate conditions. With its historical significance and functional design, this dam serves as a valuable asset in safeguarding the environment and promoting a balanced approach to water resource management.