Dam 20-9-4w, located in York, Nebraska, is a privately owned recreational dam that was completed in 1994. With a height of 27 feet and a length of 228 feet, this earth dam serves the primary purpose of recreation, offering opportunities for outdoor enthusiasts to enjoy the surrounding area. Situated on the TR-W FK Big Blue River, this dam has a low hazard potential and is deemed to be in satisfactory condition as of the last inspection in May 2016.

The dam has a storage capacity of 42 acre-feet and a maximum discharge of 557 cubic feet per second, making it an important feature for managing water resources in the region. It is regulated by the Nebraska Department of Natural Resources and undergoes regular inspections to ensure its structural integrity and safety. Despite its modest size, Dam 20-9-4w plays a crucial role in providing recreational opportunities and contributing to the overall water management efforts in the area.

Owned by a private entity, Dam 20-9-4w serves as a valuable asset for the community of McCool Junction and the surrounding area. With its stone core and soil foundation, the dam blends seamlessly into the natural landscape, offering a peaceful retreat for visitors. As climate change continues to impact water resources, the importance of properly maintaining and regulating dams like 20-9-4w becomes increasingly apparent, highlighting the intersection of water management, recreation, and environmental stewardship in the face of a changing climate.