Winkowitsch Dam, located in Sinclair, Iowa, was completed in 1967 by the USDA NRCS and is privately owned. This earth dam stands at a height of 24 feet and spans 970 feet along TR-SLIMS CREEK, with a storage capacity of 84 acre-feet. The primary purposes of this structure are for fire protection, stock, or as a small fish pond, serving as a vital resource for the local community.

With a low hazard potential and a moderate risk assessment, Winkowitsch Dam is regulated by the Iowa Department of Natural Resources and undergoes regular inspections to ensure its safety and functionality. Despite its condition not being rated, the dam continues to provide essential water management services for the area. The surrounding area includes a drainage area of 0.23 square miles and a surface area of 9 acres, making it a valuable asset for water conservation and management in Butler County, Iowa.

As a key feature in the local water infrastructure, Winkowitsch Dam plays a crucial role in maintaining water resources for fire protection and agricultural needs. Its construction and operation are overseen by the Natural Resources Conservation Service, ensuring that the dam meets regulatory standards and operates effectively. With a history dating back to the late 1960s, this dam stands as a testament to the importance of sustainable water management practices in the region, benefiting both the environment and the local community.