Block Dam, located in Crawford County, Iowa, is a private earth dam completed in 1967 with a primary purpose of fire protection, stock, or small fish pond. Managed by the USDA NRCS, this low hazard potential dam stands at 34 feet tall and spans 524 feet in length, with a storage capacity of 100 acre-feet. Serving the TR-Buck Run river/stream, Block Dam is state-regulated by the Iowa DNR, with permitting, inspection, and enforcement in place to ensure its safety and functionality.

Despite its moderate risk assessment, Block Dam has not been rated for condition assessment, and no emergency action plan (EAP) has been prepared. With a surface area of 5 acres and a drainage area of 0.5 square miles, this dam plays a crucial role in the local ecosystem and water resource management. While the spillway type is listed as uncontrolled, the dam's design and construction reflect a commitment to preserving the surrounding environment while meeting the needs of fire protection and stock pond purposes.

As a key structure in the Rock Island District, Block Dam's presence highlights the intersection of water resource management, climate resilience, and agricultural practices in the region. With ongoing monitoring and regulation by state authorities, this dam serves as a vital component in the sustainable development and conservation of water resources in Crawford County, Iowa.