Big Park Watershed Site A-4, located in Crawford County, Iowa, is a key water resource managed by the local government for purposes such as fire protection, stock, and small fish pond maintenance. Constructed in 1970 by the USDA NRCS, this earth dam stands at 32 feet high and spans 797 feet in length, with a storage capacity of 96 acre-feet. The dam serves to reduce flood risks in the area, particularly along the TR-Boyer River.

Managed by the Iowa DNR, the Big Park Watershed Site A-4 has a low hazard potential and a moderate risk assessment rating. Although the condition of the dam is currently not rated, it is regularly inspected and maintained by state authorities. With a drainage area of 2.61 square miles and a surface area of 6 acres, this site plays a crucial role in water resource management and climate resilience efforts in the region.

As part of the Rock Island District, the Big Park Watershed Site A-4 is an essential component of the local water infrastructure, providing vital services to the community while also addressing environmental concerns. With its strategic location and design, this watershed site represents a sustainable approach to water management, ensuring the safety and well-being of residents in the area while also supporting ecological balance and resilience in the face of changing climate patterns.