Karsten No. 2, located in Dodge County, Wisconsin, is a privately owned earth dam constructed in 1973 by the USDA NRCS for recreational purposes on Oliver Creek. Standing at 24 feet high and 850 feet long, this dam has a storage capacity of 100 acre-feet and a drainage area of 1 square mile. With a maximum discharge of 110 cubic feet per second, the dam poses a low hazard potential and is currently in fair condition.

Managed by the Wisconsin Department of Natural Resources, Karsten No. 2 is subject to state regulations, permitting, inspection, and enforcement. Its spillway type is uncontrolled, and the dam has been assessed as having a moderate risk level. Despite its age, the dam is regularly inspected every 10 years, with the last assessment conducted in June 2020. With its picturesque location and water-based recreational opportunities, Karsten No. 2 is a valuable resource for both locals and visitors alike, serving as a vital component of the region's water infrastructure.