Dd No 6-29 (Mast) is a local government-owned earth dam located in Nemaha, Kansas, designed by Speaker and King in 1984 for flood risk reduction along the Wolfley Creek-TR. The dam stands at a height of 25.5 feet and has a length of 505 feet, with a storage capacity of 72 acre-feet. Despite being rated as having a low hazard potential, it is considered to have a moderate risk due to its location and purpose.

The dam's primary purpose is flood risk reduction, with additional purposes including debris control. It is equipped with an uncontrolled spillway with a width of 50 feet and no outlet gates. The dam is not regulated by the state and does not require permitting, inspection, or enforcement. Although its condition has not been rated, it is deemed to meet guidelines for emergency action plans, with moderate risk management measures in place.

Overall, Dd No 6-29 (Mast) serves as a critical infrastructure for managing flood risks in the region and plays a vital role in protecting the surrounding area from potential inundation. Its design, construction, and location emphasize the importance of proactive risk management and emergency preparedness to ensure the safety and security of the community in the event of a flood or other water-related disaster.