Gannon Dam, located in Jasper County, Iowa, is a privately owned earth dam designed by the USDA NRCS and completed in 1971. With a height of 29 feet and a length of 490 feet, the dam serves multiple purposes including fire protection and creating a small fish pond. It has a storage capacity of 106 acre-feet and covers a surface area of 3 acres, with a drainage area of 0.1 square miles.

The dam is regulated by the Iowa DNR and is subject to state permitting, inspection, and enforcement. Despite being classified as having a low hazard potential, the risk assessment for Gannon Dam indicates a moderate risk level. The spillway type is uncontrolled, and there are no outlet gates or associated structures. The dam is situated on TR-Sugar Creek and falls under the jurisdiction of the Rock Island District of the US Army Corps of Engineers.

Overall, Gannon Dam is a vital structure for water resource management in the area, providing essential services for fire protection and recreational activities like fishing. Although it is considered to have a moderate risk level, the dam remains well-maintained and its condition is currently not rated. With its strategic location and functional design, Gannon Dam continues to play a crucial role in water conservation efforts in Iowa.