Koch Dam, located in Clarke County, Iowa, was completed in 1997 and serves multiple purposes including fire protection, stock watering, and as a small fish pond. The dam, primarily made of earth with a stone core and soil foundation, stands at a height of 28 feet and spans a length of 288 feet. The reservoir created by Koch Dam has a normal storage capacity of 12 acre-feet and covers a surface area of 2 acres, with a drainage area of 0.07 square miles.

Managed by a private owner, Koch Dam is classified as having a low hazard potential and a moderate risk assessment rating. Despite not being regulated or inspected by state agencies, the dam is designed and constructed by the USDA NRCS, and falls under the jurisdiction of the Kansas City District of the US Army Corps of Engineers. The dam's spillway is uncontrolled, and there are no outlet gates or associated locks. With its picturesque location along the TR- South River, Koch Dam provides a valuable water resource for the community of Indianola and surrounding areas while also contributing to local wildlife habitat and recreational opportunities.