Jonjak is a privately owned earth dam located in Sawyer, Wisconsin, near the Minnemac Lake Outlet. Constructed in 1967 by the USDA NRCS, this dam stands at 11 feet tall and spans 280 feet in length, with a storage capacity of 130 acre-feet. The primary purpose of Jonjak is categorized as "Other," serving as a crucial infrastructure for water resource management in the area.

With a low hazard potential and a moderate risk assessment rating, Jonjak is deemed to be in satisfactory condition, although detailed assessments are currently not available. The dam features uncontrolled spillways and outlet gates, contributing to its functional design. While the dam is not under the jurisdiction of state agencies for regulation, inspection, or enforcement, it is a part of the Detroit District managed by the USDA NRCS.

Water resource and climate enthusiasts interested in the intricate details of Jonjak's design, construction, and operational history will find valuable insights in this data set. The dam's location, dimensions, storage capacity, and associated risk factors provide a comprehensive overview of its significance in managing water flow and storage in the region. As a privately owned structure with federal funding and design support, Jonjak represents a collaborative effort to ensure the safety and efficiency of water management systems in Sawyer, Wisconsin.