Gannon Dam, located in Jasper County, Iowa, was completed in 1969 and serves multiple purposes including fire protection, stock watering, and small fish pond recreation. Owned privately, the dam is regulated by the Iowa Department of Natural Resources and is subject to state permitting, inspection, and enforcement. The dam, designed by the USDA NRCS, is an earth structure with a height of 27 feet and a length of 300 feet, providing a storage capacity of 48 acre-feet and covering a surface area of 3 acres.

Situated on the TR-Skunk River, Gannon Dam has a low hazard potential and a moderate risk assessment rating. Its spillway type is uncontrolled, and it has not been modified in recent years. Although the dam's condition has not been formally assessed, it is deemed to be in a satisfactory state. While the dam does not fall under the jurisdiction of the US Army Corps of Engineers, it is subject to state regulations and oversight, ensuring its safe operation and maintenance for the surrounding community and ecosystem. Water resource and climate enthusiasts can appreciate the role of Gannon Dam in providing essential services while managing potential risks associated with its operation.