Located in Cherokee, Iowa, the Simonsen Subwatershed Sta 123+48 Main is a critical water resource infrastructure managed by the local government with design support from the USDA NRCS. This earth dam, completed in 1952, serves multiple purposes such as fire protection, stock maintenance, and small fish pond management, while also contributing to flood risk reduction in the area. With a dam height of 33 feet and a storage capacity of 137 acre-feet, this structure plays a key role in managing water resources in the region.

The dam, situated on Rock Creek, covers a drainage area of 0.86 square miles and has a surface area of 4.4 acres. Despite its low hazard potential, the structure's condition remains unrated, with moderate risk assessment indicating the need for ongoing monitoring and potential management measures. With state regulation and enforcement in place, including permitting and inspection requirements by the Iowa DNR, the Simonsen Subwatershed Sta 123+48 Main demonstrates a commitment to ensuring the safety and sustainability of water resources in the area.

As a part of the broader water resource management strategy in the region, this dam contributes to the overall resilience of the local ecosystem and community against flood events. With its historical significance and ongoing operational importance, the Simonsen Subwatershed Sta 123+48 Main serves as a valuable asset for water resource and climate enthusiasts interested in understanding the intersection of infrastructure, environmental stewardship, and climate adaptation in Iowa's water management landscape.