Black Creek, also known as Bern Wetlands, is a local government-owned recreational dam located in Marathon, Wisconsin. Completed in 1968, this earth dam stands at a height of 6.1 meters with a hydraulic height of 4 meters and a length of 1100 meters. The dam has a storage capacity of 610 acre-feet and serves primarily for recreational purposes.

Managed by the Wisconsin Department of Natural Resources, Black Creek has a low hazard potential and is classified as having a fair condition assessment. With a moderate risk level, the dam has undergone modifications in 2002 and is inspected every 10 years. The spillway, with a width of 120 meters, is uncontrolled, and the dam area covers 65 acres with a drainage area of 9 square miles. Overall, Black Creek serves as a valuable recreational resource in the region while also contributing to water conservation efforts and climate resilience.