Seley Dam, located in Macksburg, Iowa, is a privately owned earth dam completed in 1990 for fire protection and as a stock or small fish pond. Spanning 460 feet in length and standing at a height of 26 feet, it has a storage capacity of 52 acre-feet and covers a surface area of 3.1 acres. The dam is situated on TR- Marvel Creek and is regulated by the Iowa Department of Natural Resources, with inspections and enforcement measures in place to ensure its safety and compliance with state regulations.

Despite its low hazard potential and moderate risk assessment rating, Seley Dam has not been given a condition assessment. This lack of rating could be attributed to the absence of recent inspections or condition evaluations. The dam's spillway is uncontrolled, with no outlet gates or locks present. While the dam does not currently pose a significant risk, continued monitoring and maintenance will be essential to ensure its long-term safety and functionality. Water resource and climate enthusiasts interested in Seley Dam will find its unique characteristics and regulatory oversight intriguing, making it a noteworthy structure in the region.