B-4, located in Uniontown, Kansas, is a local government-owned dam designed by AG Engineering with a primary purpose of flood risk reduction along the Wolfpen Creek-TR. Completed in 2014, this earth dam stands at 31 feet high and spans 750 feet in length, with a storage capacity of 306.1 acre-feet and a surface area of 7.06 acres. Despite its low hazard potential and moderate risk assessment, the dam has not been rated for its condition, and its last inspection took place in April 2015.

Managed by the Kansas Department of Agriculture, B-4 operates under state regulations for permitting, inspection, and enforcement. The dam features an uncontrolled spillway with a width of 50 feet and does not have any outlet gates. While the dam serves additional purposes such as debris control and creating a fish and wildlife pond, its primary focus remains on flood risk reduction for the surrounding area. With its strategic location and design, B-4 plays a crucial role in protecting the community from potential flooding events.