Dam No 1, also known as Johnson CO Rural Water District 2 Dam, is a public utility dam located in Johnson County, Kansas. Completed in 1965, this earth dam stands at a height of 34 feet and has a hydraulic height of 36 feet. With a primary purpose of recreation, the dam offers a surface area of 16.3 acres and a normal storage capacity of 157 acre-feet.

Situated on the Blue River-TR, Dam No 1 is regulated by the Kansas Department of Agriculture and undergoes regular inspections to ensure its structural integrity. With a low hazard potential and a moderate risk assessment rating, the dam is considered to be in satisfactory condition. Despite being uncontrolled, the spillway of the dam has a width of 50 feet to manage potential excess water flow.

Overall, Dam No 1 serves as a vital water resource structure in the area, providing recreational opportunities while also ensuring the safety of the surrounding community. With its modest storage capacity and well-maintained condition, this dam plays a crucial role in water management and conservation efforts in Johnson County, Kansas.