Jack Sinn Wetland Dam, located in Lancaster County, Nebraska, is a state-regulated water resource managed by the Nebraska Department of Natural Resources. Built in 2000 by the USDA NRCS, this earth dam stands at a height of 15 feet and serves as a Fish and Wildlife Pond with a storage capacity of 179 acre-feet. The dam has a low hazard potential and is in satisfactory condition as of its last inspection in July 2011.

Situated along the TR-ASH HOLLOW CREEK, Jack Sinn Wetland Dam covers a surface area of 63 acres and has a drainage area of 0.2 square miles. With a maximum discharge capacity of 17 cubic feet per second, the dam provides essential habitat for aquatic wildlife and contributes to the conservation efforts in the region. The dam's primary purpose is to support fish and wildlife populations, making it a valuable resource for environmental enthusiasts and climate conservationists.

Managed by the Natural Resources Conservation Service and located in the city of Greenwood, Jack Sinn Wetland Dam plays a crucial role in regulating water flow and preserving the surrounding ecosystem. With its stone core and soil foundation, the dam exemplifies sustainable infrastructure design and underscores the importance of responsible water management practices. As a focal point for water resource and climate enthusiasts, Jack Sinn Wetland Dam stands as a testament to the intersection of environmental conservation and engineering excellence in safeguarding our natural resources for future generations.