Yellowsmoke Watershed Site D-1 is a privately owned dam located in Denison, Iowa, along the TR- East Boyer River. Built in 1989 by the Soil Conservation Service (SCS), this Earth-type dam stands at a height of 24 feet and spans 445 feet in length. With a primary purpose of providing fire protection, stock, or a small fish pond, the dam has a storage capacity of 68 acre-feet and covers a surface area of 4.9 acres.

Managed and regulated by the Iowa Department of Natural Resources (DNR), Yellowsmoke Watershed Site D-1 is designed to control debris and offer protection against wildfires. Despite being rated as having low hazard potential and receiving a moderate risk assessment score of 3, the dam's condition has not been officially assessed. While it lacks certain features such as outlet gates and a controlled spillway, this site plays a crucial role in maintaining water resources and supporting the local ecosystem in Crawford County, Iowa.

Water resource and climate enthusiasts will find Yellowsmoke Watershed Site D-1 to be an intriguing case study in the management and regulation of small-scale dams. With its location along the TR- East Boyer River and its primary purposes of fire protection and stock, this Earth-type dam serves as a vital infrastructure for the local community. Despite its age, the dam continues to fulfill its intended functions, showcasing the importance of proper maintenance and oversight in safeguarding water resources and mitigating potential risks.