Harmon Creek (Pa-484) is a crucial flood risk reduction structure located in Washington, Pennsylvania. Managed by the local government and designed by USDA NRCS, this earth dam stands at a height of 67 feet and stretches 320 feet in length. Completed in 1971, it serves the primary purpose of flood risk reduction for the surrounding area.

With a storage capacity of 190 acre-feet and a drainage area of 0.7 square miles, Harmon Creek plays a vital role in managing water flow and minimizing flood risks in the region. Despite its high hazard potential, the dam is in satisfactory condition and undergoes regular inspections to ensure its continued effectiveness. The Pennsylvania Department of Environmental Protection oversees the regulatory aspects of the dam, including permitting, inspection, and enforcement.

Located in Hanover Township and part of the TR Harmon Creek system, this structure is a key component of the local water resource management infrastructure. Its strategic design and maintenance highlight the importance of proactive flood risk reduction measures in safeguarding communities and ecosystems against the impacts of climate change.