Marshall Dam, located in Montgomery County, Iowa, is a privately owned earth dam that was completed in 1989 for multiple purposes including fire protection, stock, and small fish pond. With a height of 33 feet and a length of 230 feet, the dam has a storage capacity of 45 acre-feet and a surface area of 2.6 acres. Situated on the TR-Nodaway River, the dam is regulated by the Iowa Department of Natural Resources and is subject to state permitting, inspection, and enforcement.

Despite being classified as having a low hazard potential, Marshall Dam is considered to have a moderate risk level due to its condition being "Not Rated". The dam features an uncontrolled spillway type and has not been modified since its construction. While the dam does not have outlet gates or associated structures, it serves as a crucial resource for fire protection and aquatic life support in the area. With its strategic location and design by the USDA NRCS, Marshall Dam stands as a vital water resource for the community of Villisca and beyond.

Water resource and climate enthusiasts will appreciate the ecological significance of Marshall Dam, as it provides essential water storage and habitat for local wildlife. The dam's moderate risk level underscores the importance of ongoing maintenance and monitoring to ensure its continued safety and functionality. With its low hazard potential and regulated status, Marshall Dam serves as a model for responsible dam construction and management in Iowa, showcasing the vital role that infrastructure plays in supporting both human and environmental needs in a changing climate.