Wilson Dam is an earth-fill embankment dam with a foundation of rock and soil. It stands tall and long. At its crest, the dam has an elevation of . An uncontrolled, spillway is located at the southeast end of the dam. The dam's outlet works consist of one gated conduit wide and long. When the reservoir is filled to maximum capacity, the spillway has a discharge capacity of . When it is filled to flood control capacity, the outlet works conduit has a discharge capacity of .
