Riverdale, located in Somerset, Wisconsin, is a hydroelectric dam along the Apple River that was completed in 1905. This gravity dam stands at 27 feet tall and has a storage capacity of 569 acre-feet, providing both hydroelectric power and recreational opportunities for the area. With a maximum discharge of 3300 cubic feet per second, Riverdale is a crucial infrastructure for managing water resources in St. Croix County.

Managed by the Federal Energy Regulatory Commission, Riverdale has a high hazard potential and is categorized as a very high-risk structure. Despite its age, the dam has not undergone a recent condition assessment, and the emergency action plan is not fully up to date. With its controlled spillway and multiple outlet gates, Riverdale plays a vital role in water management and energy production in the region, highlighting the intersection of water resource management and climate considerations in infrastructure planning.