Grandmother is a captivating hydroelectric dam located on the Wisconsin River in Lincoln, Wisconsin. Built in 1923, this gravity dam stands at an impressive height of 39 feet and spans 724 feet in length. As a key structure for hydroelectric power generation, Grandmother has a maximum discharge capacity of 61,500 cubic feet per second and a surface area of 758 acres. The dam is regulated by the Federal Energy Regulatory Commission and is considered to have a high hazard potential due to its critical role in water resource management.

Despite its age, Grandmother dam has been maintained well, with the last inspection conducted in September 2020. The dam's spillway, with a controlled design and a width of 208 feet, ensures the safe release of excess water during peak flow periods. The dam's emergency action plan was last revised in December 2020, indicating a proactive approach to risk management. With its strategic location and significant contribution to hydroelectric power generation, Grandmother dam stands as a testament to sustainable energy production and effective water resource management in Wisconsin. For water resource and climate enthusiasts, Grandmother represents a historical landmark that continues to play a crucial role in the region's energy infrastructure.