Located in Jasper County, Iowa, Gannon Dam is a privately-owned structure with a primary purpose of fire protection, stock, or small fish pond. Built in 1970 by USDA NRCS, this earth dam stands at 30 feet high and spans 250 feet in length, with a storage capacity of 30 acre-feet. Situated on TR-Indian Creek, Gannon Dam is regulated by the Iowa DNR and undergoes regular state inspection and enforcement to ensure its safety and functionality.

With a low hazard potential and a moderate risk assessment rating, Gannon Dam provides essential services for fire protection and water storage in the area. The dam's spillway, of uncontrolled type, helps manage water flow during times of excess. While not currently rated for condition assessment, the dam is well-maintained and meets state regulatory guidelines, contributing to its overall reliability and safety.

Water resource and climate enthusiasts will appreciate Gannon Dam's role in providing essential water management functions in the region. As a privately-owned structure with a long history of service, Gannon Dam stands as a testament to the importance of sustainable water infrastructure and the collaborative efforts of government agencies and private owners in safeguarding our natural resources.