Hopp Dam, located in Charter Oak, Iowa, is a privately owned structure designed by the NRCS with a primary purpose of providing fire protection, stock, or a small fish pond. Completed in 2006, this earth dam stands at a height of 27 feet and has a length of 410 feet, with a storage capacity of 67 acre-feet. Situated on TR-Emigrant Creek, the dam serves as a crucial water resource for the surrounding area, with a surface area of 3.9 acres and a drainage area of 0.34 square miles.

Despite its low hazard potential and moderate risk assessment, Hopp Dam is regulated by the Iowa Department of Natural Resources, with permitting, inspection, and enforcement measures in place. The dam features an uncontrolled spillway with a width of 2 feet, and although it has not been rated for its current condition, it plays a vital role in water management for fire protection and agricultural purposes in Crawford County, Iowa. With its strategic location and reliable infrastructure, Hopp Dam remains a key asset in the region's water resource and climate management efforts.