Dd No 1-20, located in Pawnee, Kansas, is a local government-owned earth dam designed by the USDA NRCS with a primary purpose of flood risk reduction. Completed in 1984, this dam stands at a height of 28 feet and has a length of 2694 feet, providing a normal storage capacity of 72 acre-feet and a maximum storage of 4230 acre-feet. The dam is situated on Sawmill Creek and has a drainage area of 16.64 square miles, with a moderate risk assessment rating of 3.

Despite its low hazard potential, Dd No 1-20 is regulated by the Kansas Department of Agriculture and undergoes regular inspections, permitting, and enforcement. The dam features an uncontrolled spillway with a width of 180 feet and no outlet gates. With a surface area of 35 acres and a maximum discharge capacity of 4377 cubic feet per second, this dam plays a crucial role in mitigating flood risks in the area. However, the condition assessment of Dd No 1-20 is currently labeled as "Not Rated", indicating a need for further evaluation and maintenance.

Overall, Dd No 1-20 is a vital infrastructure for flood risk reduction in Larned, Kansas, serving its purpose effectively with a moderate risk assessment rating. Managed by the Natural Resources Conservation Service, this dam provides critical protection for the surrounding community and supports water resource management efforts in the region. As climate change continues to impact water resources, the maintenance and monitoring of Dd No 1-20 will be essential to ensure its continued effectiveness in safeguarding against potential flooding events.