Crooked Creek R-2, also known as Lake Shamrock, is a local government-owned dam in Freeburg, Minnesota, designed by USDA NRCS in 1966 for flood risk reduction along Crooked Creek. The earth dam stands at a height of 48 feet and has a length of 535 feet, with a storage capacity of 314 acre-feet and a normal storage of 112 acre-feet. The dam's spillway is uncontrolled, with a width of 35 feet, and has a significant hazard potential but is currently in satisfactory condition as of the last assessment in 2016.

This dam plays a critical role in managing flood risk in the area, with a moderate risk assessment rating of 3. The Minnesota Department of Natural Resources regulates and inspects the dam, ensuring that it meets state permitting and enforcement requirements. Although the dam has not been modified in recent years, it undergoes inspections every four years to ensure its continued safety and effectiveness in protecting the surrounding community from potential flooding events. The dam's location in Houston County, Minnesota, makes it a key asset in water resource management and climate resilience efforts in the region.