Holm Dam, located in Patterson, Iowa, is a privately owned earth dam constructed in 1972 by the USDA NRCS for fire protection, stock, and small fish pond purposes. The dam stands at a height of 36 feet with a length of 580 feet, creating a storage capacity of 112 acre-feet and a surface area of 8.6 acres. With a low hazard potential and a moderate risk assessment rating, Holm Dam is regulated by the Iowa Department of Natural Resources and undergoes regular state inspections and enforcement to ensure its safety and functionality.

Situated on the TR-Fletcher Branch river, Holm Dam serves as a vital resource for water management and recreation in the area, offering opportunities for fishing and wildlife habitat enhancement. Although it lacks certain features like outlet gates and spillway controls, the dam's design by the Natural Resources Conservation Service reflects a commitment to sustainable water resource management. With its location in Madison County, Iowa, and under the jurisdiction of the Kansas City District, Holm Dam is a key component of the local ecosystem and contributes to the overall water infrastructure of the region.

Overall, Holm Dam represents a harmonious balance between human needs for water resource management and environmental conservation. As a privately owned structure with state oversight, the dam plays an essential role in providing fire protection, livestock watering, and recreational opportunities while maintaining a low-risk profile. With its solid construction and regular inspections, Holm Dam stands as a testament to responsible water resource management and climate adaptation in the face of changing environmental conditions.