Orson Pond Dam is classified as a 'Significant' hazard - 'Small' size dam. The dam was found to be in fair overall condition at the time of inspection. Hydraulic/hydrologic evaluations, performed in accordance with procedures established by the Baltimore District, Corps of Engineers, for Phase I Inspection Reports, revealed that the spillway will not pass the 100-year flood without overtopping the dam. A spillway design flood (SDF) in the range of the 100-year flood to the 1/2 Probable Maximum Flood (1/2 PMF) is required for Orson Pond Dam. Because the dam is on the low end of the 'Small' size category in terms of storage capacity and height, the 100-year flood was chosen as the SDF. During the 100-year flood, the dam is overtopped by a maximum depth of 1.79 feet for a total duration of 9.33 hours. The spillway is therefore considered 'inadequate.' It is recommended that the owner immediately develop recommendations for remedial measures to reduce the overtopping potential of the dam. Several items of remedial work should be immediately initiated by the owner.