Jansma Dam, located in Lyon County, Iowa, is a private-owned structure designed by USDA SCS with a primary purpose of fire protection, stock, or small fish pond. Completed in 1970, this earth dam stands at a height of 22 feet and spans a length of 834 feet, with a storage capacity of 132 acre-feet. Situated on the TR-Little Rock River, the dam serves as a recreational area and plays a crucial role in water resource management in the region.

Managed by the Iowa DNR, Jansma Dam is regulated, inspected, and enforced by the state to ensure its safety and functionality. With a low hazard potential and a moderate risk assessment score of 3, the dam has not been rated for its condition, but it meets guidelines for emergency action planning. Despite its uncontrolled spillway and limited drainage area, the dam continues to provide essential benefits for fire protection, stock watering, and recreational activities in the area.

Overall, Jansma Dam serves as a vital infrastructure for water resource management and climate resilience in Lyon County. With its strategic location, design, and operational mechanisms, the dam contributes to the local community's water needs while also offering opportunities for leisure and recreation. As climate enthusiasts and water resource advocates, understanding and monitoring structures like Jansma Dam are crucial for ensuring sustainable water management practices and adapting to changing environmental conditions in the region.