Geiger is a privately owned dam located in Niobrara, Wyoming, along the Chapman Draw river. Completed in 1952 for irrigation purposes, this Earth dam stands at 32 feet in height and stretches 709 feet in length, with a storage capacity of 544 acre-feet. The dam is regulated by the State of Wyoming and undergoes regular inspections, although its condition assessment is currently rated as poor.

Despite its low hazard potential, Geiger poses a moderate risk according to the latest assessment. The dam features an uncontrolled spillway with a width of 200 feet and is equipped with a single slide gate for outlet control. Its location in Edgemont, SD, makes it an essential water resource for the surrounding area. However, with a risk management plan yet to be disclosed, the future maintenance and safety of the dam remain a concern for water resource and climate enthusiasts.