Dam No 1, also known as Sugar Valley Dam No 1, is a privately owned structure located in Linn, Kansas, along the Mine Creek. This earth dam stands at a height of 65 feet and has a hydraulic height of 65 feet, with a structural height of 67 feet. Completed for recreational purposes, Dam No 1 has a storage capacity of 2669 acre-feet and covers a surface area of 83.5 acres. The dam's spillway is uncontrolled, with a width of 80 feet, and it has a high hazard potential due to its condition assessment being deemed satisfactory.

The dam, designed by Jonas Engineering Co, is regulated by the Kansas Dept. of Agriculture and undergoes regular inspections, with the last one conducted in April 2018. With a moderate risk assessment rating of 3, Dam No 1 is situated in a region represented by Congressman Steven C. Watkins, Jr. (R). The surrounding area offers recreational opportunities, with the dam serving as a popular spot for outdoor activities. Despite its high hazard potential, the dam is currently in a satisfactory condition, ensuring the safety of both the structure and the local community.

In addition to its recreational purpose, Dam No 1 plays a crucial role in managing water resources in the region. With a drainage area of 1.39 square miles and a maximum discharge capacity of 4137 cubic feet per second, the dam helps control water flow along the Mine Creek. Its strategic location and design make Dam No 1 a valuable asset for water resource management and climate resilience efforts in the state of Kansas.