Little Yellow 30, located in Juneau, Wisconsin, is a state-regulated dam with a primary purpose of irrigation and also serves for recreation and water supply. Completed in 1935, this gravity dam stands at 8 feet high and has a storage capacity of 130 acre-feet. With a normal storage capacity of 30 acre-feet and a surface area of 25 acres, the dam plays a crucial role in managing water resources in the area.

The dam, situated on Johnson Lateral, is under the jurisdiction of the Wisconsin Department of Natural Resources and undergoes regular inspections, enforcement, and permitting. Despite being rated as having low hazard potential, the dam is considered to have a very high risk due to its condition assessment not being rated. The dam's spillway type is controlled, and it has a maximum discharge capacity of 371 cfs, ensuring effective water management and flood control measures in the region.

Little Yellow 30 is a significant infrastructure contributing to the sustainable use of water resources in Wisconsin. With its multifaceted purposes and regulatory oversight, the dam serves as a vital component in the state's water management strategy. Climate and water resource enthusiasts would find interest in exploring the details and significance of this dam in maintaining the ecological balance and meeting the water demands of the surrounding communities.