This report presents the results of a specific site assessment of the dam safety of six coal combustion waste (CCW) impoundments at the Gibson Generating Station in Owensville, Indiana. The Gibson Generating Station is operated by Duke Energy Indiana, Inc. (DEI) and owned by DEI, Wabash Valley Power Association, Inc. and Indiana Municipal Power Agency. The six impoundments are the North Ash Pond, North Settling Basin, East Ash Ponds Number 1, Number 2, and Number 3, and the East Settling Basin. These six impoundments comprise the active coal combustion waste facility at the Gibson Generating Station. Other coal combustion waste impoundments at the Gibson Generating Station include the South Ash Pond and Basin, which have been closed under Indiana Beneficial Use Statute IC-13-19-3-3. The specific site assessment was performed on April 26 and 27 of 2010. The specific site assessment was performed with reference to Federal Emergency Management Agency (FEMA) guidelines for dam safety, which includes other federal agency guidelines and regulations (such as U.S. Army Corps of Engineers (USACE) and U.S. Bureau of Reclamation (USBR)) for specific issues, and defaults to state requirements were not specifically addressed by federal guidance or if the state requirements were more stringent.