Big Park Watershed Site F-3 is a locally owned and regulated dam located in Crawford, Iowa, specifically in the city of Dow City. The dam, completed in 1965 by the USDA NRCS, serves multiple purposes including fire protection, stock watering, small fish pond management, flood risk reduction, and recreation. With a height of 33 feet and a length of 465 feet, the dam has a storage capacity of 150 acre-feet and covers a surface area of 9 acres. It is designed to control the Boyer River's flow and has a low hazard potential with a moderate risk assessment rating.

Managed by the Iowa DNR, this earth dam plays a critical role in water resource management and climate resilience in the region. Despite not being rated for condition assessment and lacking specific emergency action plans, the dam is inspected, permitted, and regulated by the state authorities to ensure its structural integrity and functionality. The dam's location within the Big Park Watershed provides valuable insights for water resource and climate enthusiasts interested in sustainable water infrastructure and environmental conservation efforts in the area.