Dd No 1-1a is a dam located in Bourbon, Kansas, designed by Agricultural Eng. Assoc. and completed in 1995 for the primary purpose of flood risk reduction. The dam is regulated by the Kansas Department of Agriculture and is in a state jurisdiction with permits, inspections, and enforcement in place. It stands at a height of 37 feet and has a length of 600 feet, providing a storage capacity of 476.29 acre-feet with a normal storage of 43.28 acre-feet.

Situated on Hinton Creek-TR in Bourbon, Kansas, Dd No 1-1a has a low hazard potential and a moderate risk assessment rating of 3. The dam's spillway type is uncontrolled with a width of 75 feet, and it has no outlet gates or associated structures. The last inspection date was in October 1998, with the condition assessment marked as "Not Rated." While the dam does not have an emergency action plan in place, it meets regulatory guidelines and has not been modified since its completion.

Overall, Dd No 1-1a serves as a vital infrastructure for flood risk reduction in the area, maintaining a stable condition and providing moderate risk management measures. Water resource and climate enthusiasts can appreciate the importance of this earth dam in safeguarding the local community against potential flooding events on Hinton Creek-TR in Bourbon, Kansas.