Frank Riley Dam, located in Lucas, Iowa, is a private dam designed by the USDA NRCS for grade stabilization purposes. Completed in 2017, this earth dam stands at a height of 32 feet and has a length of 392 feet, with a storage capacity of 32 acre-feet. Serving multiple purposes including grade stabilization, recreation, and water supply, the dam plays a crucial role in managing water resources in the area.

With a low hazard potential and a moderate risk assessment rating, Frank Riley Dam is regulated by the Iowa DNR and undergoes regular inspections to ensure its safety and effectiveness. Despite not having a condition assessment rating, the dam is deemed to meet guidelines for emergency action plans, although specific details on preparedness and contacts are not provided in the data. The dam's spillway type is uncontrolled, with a spillway width of 20 feet, and it is part of the Kansas City District under Congressional District 02 in Iowa.

Overall, Frank Riley Dam stands as an important infrastructure for water management in Clarke County, Iowa, contributing to grade stabilization efforts and providing recreational opportunities for the local community. With its strategic location near the Trib to North Hoosier Creek, the dam serves as a vital resource for water supply and contributes to the overall environmental sustainability of the region. Despite its low hazard potential, ongoing monitoring and maintenance ensure the continued safety and functionality of this essential water resource infrastructure.