Diamondhead Lake Dam in Guthrie, Iowa, stands as a vital structure regulating Long Branch Creek's flow. Owned privately, the dam was designed by A LEO PELDS ENGINEERING and completed in 1963 for recreational purposes. With a height of 43 feet and a length of 880 feet, the dam stores up to 1900 acre-feet of water and covers a surface area of 102 acres.

Managed by the Iowa Department of Natural Resources, Diamondhead Lake Dam poses a significant hazard potential but is currently in satisfactory condition, as per the last inspection in July 2019. Despite its uncontrolled spillway type, the dam's risk assessment is moderate, with a five-year inspection frequency ensuring its safety. Situated in Van Meter, the dam serves as a picturesque recreational spot while fulfilling its crucial role in water resource management and climate resilience efforts in the region.

Water resource and climate enthusiasts can appreciate Diamondhead Lake Dam's contribution to regulating water flow and providing recreational opportunities in Guthrie, Iowa. Its earth dam structure, designed for soil foundation, offers storage capacity for up to 1900 acre-feet of water. Managed by the Iowa DNR, the dam ensures public safety through regular inspections and maintenance, reflecting a moderate risk assessment despite its significant hazard potential. As a vital component of the region's infrastructure, Diamondhead Lake Dam stands as a symbol of resilience in the face of changing climatic conditions, serving both practical and recreational purposes for the local community.