Rynearson Dam No. 2, located in Necedah, Wisconsin, is a Federal-owned earth dam that was completed in 1939. Managed by the Fish and Wildlife Service, the primary purpose of this dam is to create a fish and wildlife pond, providing essential habitat for local species. With a height of 20 feet and a length of 2877 feet, the dam has a normal storage capacity of 1360 acre-feet and covers a surface area of 680 acres.

This dam is associated with the Branch of Little Yellow Creek and is regulated at the state level, with permitting and enforcement responsibilities falling under the jurisdiction of the state agency. The dam has a low hazard potential and is in satisfactory condition as of the last inspection in July 2018. With a history of modifications and major rehabilitation in 2002, Rynearson Dam No. 2 continues to serve its purpose of supporting fish and wildlife in the region while also contributing to local water resource management efforts.

Water resource and climate enthusiasts will appreciate the vital role that Rynearson Dam No. 2 plays in maintaining the ecological balance of the area, providing a reliable water source for wildlife and contributing to the overall health of the ecosystem. With its strategic location in Juneau County, this dam serves as a key component in the management of water resources and flood control measures in the region. As a Federal-owned structure, it exemplifies the collaborative efforts between government agencies to ensure the sustainability and resilience of water infrastructure in Wisconsin.