Dd No 6-28 Lower Dam, also known as Sedan City Lake, is a vital structure in Chautauqua County, Kansas, serving multiple purposes such as flood risk reduction and water supply. Completed in 1965, this earth dam stands at a height of 50.1 feet, with a hydraulic height of 53 feet and a structural height of 60 feet, providing a normal storage capacity of 780 acre-feet and a maximum storage capacity of 3,250 acre-feet. Located on Deer Creek, this dam plays a crucial role in managing water resources in the region.

The dam's spillway, with a width of 225 feet, is uncontrolled, and there are no outlet gates associated with the structure. The last inspection conducted in March 2020 rated the dam's condition as fair, with a high hazard potential and a moderate risk assessment. The dam is regulated by the Kansas Department of Agriculture and is subject to state permitting, inspection, and enforcement, ensuring its safe operation and maintenance to mitigate flood risks in the area.

With its proximity to Sedan City and its strategic location on Deer Creek, Dd No 6-28 Lower Dam is a key infrastructure for the community, providing flood protection and water supply for the region. The dam's designers, A&E and USDA SCS, have contributed to its construction and maintenance, highlighting the collaborative efforts involved in managing water resources and climate challenges in Kansas.