Dam No 4, located in La Cygne, Kansas, is a private-owned structure that serves the primary purpose of recreation. Built in 1985, this buttress-type dam stands at 68 feet high and spans a length of 1420 feet, with a storage capacity of 4159.4 acre-feet. It is situated on Middle Creek, within the Tulsa District of the US Army Corps of Engineers, and falls under the regulatory oversight of the Kansas Department of Agriculture.

Despite its fair condition assessment and high hazard potential, Dam No 4 has a relatively low drainage area of 2.08 square miles, with a surface area of 106.5 acres. The dam's spillway width is 100 feet, although it does not have outlet gates. The last inspection took place in December 2017, with a frequency of every 3 years. While no emergency action plan (EAP) has been reported, the dam is in compliance with state regulatory requirements for inspection, permitting, and enforcement.

For water resource and climate enthusiasts, Dam No 4 presents an interesting case study in private dam ownership and recreational land use. With its significant storage capacity and location in a high-risk area, the dam serves as a vital water resource for the local community while also posing potential safety concerns. Continued monitoring and maintenance will be crucial to ensure the dam's long-term stability and functionality in the face of changing environmental conditions.