Harold Dam, located in Montgomery County, Iowa, serves multiple purposes including grade stabilization, fire protection, stock, small fish pond, and recreation. Built in 2005 by USDA NRCS, this private-owned earth dam stands at a height of 29 feet with a length of 615 feet, providing a maximum storage capacity of 113 acre-feet. The dam is situated along a tributary to Walnut Creek, with a drainage area of 0.72 square miles and a surface area of 4 acres.

Despite its low hazard potential and not being rated for condition assessment, Harold Dam is regulated and inspected by the Iowa Department of Natural Resources. It does not have outlet gates and its spillway width is 14 feet. The dam has no associated structures and is not under the jurisdiction of the US Army Corps of Engineers. The surrounding area offers a picturesque setting for water resource and climate enthusiasts to explore and appreciate the importance of sustainable water management practices.