Hilleary Dam is a private dam located in GEODE STATE PARK, Iowa, along the TR-CEDAR CREEK river. Built in 1989, this Earth-type dam stands at a height of 32 feet and spans a length of 280 feet, with a storage capacity of 41 acre-feet for purposes such as fire protection, stock, or small fish pond. The dam is under the regulatory oversight of the IOWA DNR and has been identified as having a low hazard potential, with a moderate risk assessment rating.

Despite being privately owned, Hilleary Dam is subject to state regulations, inspections, and enforcement, ensuring its structural integrity and safety. The dam's design was attributed to SCS, and it falls under the jurisdiction of the Kansas City District of the USACE. With its strategic location and purposeful design, the dam serves as a crucial water resource infrastructure in Des Moines, Iowa, contributing to the local ecosystem and providing essential services such as water storage and flood control.

Water resource and climate enthusiasts will appreciate the significance of Hilleary Dam in managing water resources and mitigating potential risks in the region. Its location within GEODE STATE PARK adds to its ecological value, while its low hazard potential and moderate risk assessment highlight the importance of maintaining and monitoring dams for the safety of surrounding communities. As a key player in the water infrastructure network, Hilleary Dam exemplifies the balance between harnessing water resources for various purposes and safeguarding against potential hazards in a changing climate landscape.