Four Mile Creek, also known as Nepco Lake, is a privately owned dam located in Wood County, Wisconsin. This gravity dam was completed in 1926 and serves primarily for water supply purposes, with a storage capacity of 6,000 acre-feet. The dam stands at 33 feet high with a hydraulic height of 28 feet, offering recreational opportunities and hydroelectric power generation in addition to its main function of supplying water.

Managed by the Wisconsin Department of Natural Resources, Four Mile Creek has a low hazard potential and is deemed to be in satisfactory condition as of the last assessment in 2014. Despite its age, the dam has undergone modifications in 1928 and 1950, showcasing its resilience and adaptability to changing needs and regulations. With a drainage area of 29 square miles and a maximum discharge of 2,500 cubic feet per second, the dam plays a crucial role in water resource management and flood control in the region.

Located in the city of Port Edwards, Four Mile Creek's risk assessment is rated as very high, indicating the importance of effective risk management measures in place. With controlled spillways and regular inspections, the dam ensures the safety of the surrounding community while maintaining its operational efficiency. As water resource and climate enthusiasts, the intricate details of Four Mile Creek's design, functionality, and historical significance make it a fascinating subject of study and conservation efforts in Wisconsin's diverse landscape.