Located in Keokuk, Iowa, Griener Dam is a private-owned structure built in 1975 by the USDA NRCS with a primary purpose of recreation. Standing at a height of 39 feet and a length of 335 feet, the dam holds a storage capacity of 36 acre-feet, with a normal storage level of 27 acre-feet. Situated on TR-Clear Creek, the dam serves multiple functions including fire protection, stock, and small fish pond in addition to recreational activities.

Managed by the Iowa Department of Natural Resources, Griener Dam is classified as a low hazard structure with a moderate risk assessment rating. The dam features an uncontrolled spillway and is constructed with earth materials on a soil foundation. Despite being in operation for over four decades, the dam's condition is currently listed as "Not Rated" with no recent inspection date available. With its scenic location and various recreational opportunities, Griener Dam is a valuable asset to the community, offering a peaceful retreat for water resource and climate enthusiasts to enjoy nature's beauty.