Jansen Dam, located in Lynnville, Iowa, is a privately owned earth dam completed in 2006 with a primary purpose of fire protection, stock, or small fish pond. With a height of 24 feet and a length of 312 feet, the dam has a storage capacity of 57 acre-feet and serves the North Skunk River. The dam is regulated by the Iowa Department of Natural Resources and undergoes regular inspections, enforcement, and permitting to ensure its safety and compliance with state regulations.

Despite being classified as having low hazard potential, Jansen Dam is considered to have a moderate risk level with a risk assessment rating of 3. The dam features an uncontrolled spillway with a width of 1 foot and is situated in a drainage area of 0.24 square miles. While the dam does not have outlet gates or associated structures, it plays a crucial role in providing fire protection and supporting local agriculture by serving as a stock or small fish pond. With its strategic location and function, Jansen Dam contributes to water resource management efforts in the region and showcases the importance of sustainable infrastructure development in mitigating climate impacts.