Dd No B-3 is a local government-owned earth dam located in Bourbon, Kansas, along the Marmaton River. Completed in 2000, this dam serves the primary purpose of flood risk reduction and has a maximum storage capacity of 344.5 acre-feet. With a dam height of 32.7 feet and a length of 569 feet, Dd No B-3 has a low hazard potential and is not currently rated in terms of condition assessment.

Although the dam is not under federal jurisdiction, it is regulated and inspected by the Kansas Department of Agriculture. The risk assessment for Dd No B-3 is moderate, indicating a level 3 risk. Despite not having an emergency action plan in place, the dam meets regulatory guidelines and has not undergone any recent modifications. With a controlled spillway width of 40 feet and a maximum discharge capacity of 1028 cubic feet per second, Dd No B-3 plays a crucial role in managing water resources in the region and mitigating flood risks along the Marmaton River.