Shamrock Lake in Rusk, Wisconsin, is a private reservoir managed by the USDA NRCS for irrigation and recreation purposes. Built in 1961, this earth dam has a height of 10 feet and a length of 250 feet, with a storage capacity of 370 acre-feet. The reservoir covers a surface area of 56 acres and is fed by Shamrock Creek, showcasing a scenic natural setting for water resource and climate enthusiasts to enjoy.

With a low hazard potential and a moderate risk assessment, Shamrock Lake is regulated by the Wisconsin Department of Natural Resources, ensuring that it meets state permitting, inspection, and enforcement requirements. Despite not being rated for its condition assessment, the reservoir remains a popular destination for fishing, boating, and other recreational activities. Its uncontrolled spillway and maximum discharge capacity of 150 cubic feet per second add to the lake's appeal for water enthusiasts seeking to explore and appreciate its environmental significance.

Located in a picturesque rural area with easy access for visitors, Shamrock Lake provides a tranquil escape for those interested in water resources and climate studies. The reservoir's history, design, and management by the Natural Resources Conservation Service offer valuable insights into sustainable water usage and conservation practices. Whether for irrigation or leisure, Shamrock Lake serves as a vital resource for the local community and as a fascinating subject for enthusiasts seeking to understand the intersection of water management and environmental stewardship.