Hopp Dam (Lower Site) in Malvern, Iowa, is a privately-owned earth dam designed by USDA NRCS for grade stabilization purposes. Completed in 2005, this dam has a height of 30 feet and a length of 268 feet, providing a storage capacity of 30 acre-feet. With a primary purpose of grade stabilization, it also serves as a fire protection, stock, or small fish pond.

Situated on a tributary to Silver Creek, this dam has a low hazard potential and has not been rated for its current condition. While it does not have outlet gates, it features a spillway width of 20 feet and a drainage area of 0.47 square miles. The dam's location in Mills County, Iowa, makes it a notable structure for water resource and climate enthusiasts interested in sustainable water management and environmental conservation efforts in the region.

Overall, Hopp Dam (Lower Site) is a vital infrastructure for flood control and water storage in the area, contributing to the protection of downstream communities and ecosystems. With its construction meeting state permitting and inspection requirements, this dam stands as a testament to effective collaboration between private ownership and government agencies in ensuring water resource sustainability and resilience against climate impacts in Iowa.