Jass Dam, located in Decatur County, Iowa, was completed in 1979 and is owned by a private entity. The dam, designed by the USDA NRCS, serves multiple purposes including fire protection, stock, and small fish pond management. With a height of 26 feet and a length of 490 feet, the dam has a storage capacity of 76 acre-feet and covers a surface area of 5.7 acres.

The primary source agency for Jass Dam is the Iowa Department of Natural Resources, which regulates and inspects the dam to ensure its safety and compliance with state standards. The dam is situated on Steele Creek and is classified as an earth dam with a soil foundation. Despite its low hazard potential, the dam has a moderate risk rating of 3, prompting the need for risk management measures to be implemented.

The dam's spillway is uncontrolled, and it does not have outlet gates or associated structures. While the condition assessment of Jass Dam is currently not rated, its risk assessment indicates a moderate level of risk. As a popular water resource and climate enthusiast destination, Jass Dam presents an opportunity for further exploration and study in the realm of sustainable water management practices and climate resilience efforts.