Dd No 55 is a local government-owned dam located in Lake Wabaunsee, Kansas, designed by King Engineering. This earth dam, with a height of 39.4 feet and a length of 568 feet, serves the primary purpose of flood risk reduction along the Mill Creek-TR river stream. With a storage capacity of 533 acre-feet, the dam has a low hazard potential and is currently in satisfactory condition according to the last inspection in June 2016.

The dam features an uncontrolled spillway with a width of 100 feet and has a normal storage capacity of 50 acre-feet. Its drainage area is 1.84 square miles, with a maximum discharge of 5129 cubic feet per second. Although there have been no modifications in recent years, the dam is regulated, permitted, inspected, and enforced by the Kansas Department of Agriculture, ensuring its compliance with state regulations and safety standards. With a moderate risk assessment score of 3, the dam's risk management measures are currently undefined, highlighting the need for ongoing monitoring and maintenance to ensure its continued effectiveness in flood risk reduction for the surrounding area.