Harmony Creek Watershed Site 1, located in Harrison County, Iowa, is a vital earth dam completed in 1958 for multiple purposes including fire protection, stock maintenance, and small fish pond establishment. Managed by the local government and designed by USDA NRCS, this dam serves as a key feature on Harmony Creek, with a maximum storage capacity of 755 acre-feet and a drainage area of 4.46 square miles. The dam's low hazard potential and moderate risk assessment make it a critical infrastructure for flood risk reduction in the region.

With a structural height of 43 feet and a length of 758 feet, Harmony Creek Watershed Site 1 has a surface area of 32.4 acres and a normal storage capacity of 390 acre-feet. The dam's uncontrolled spillway type and soil foundation reflect its design for efficient water management and protection against potential hazards. Although the dam's condition assessment is currently not rated, its state-regulated status and compliance with inspection, permitting, and enforcement requirements by the Iowa DNR ensure its operational effectiveness and safety standards for the community and the environment.