On September 24, 2004 during a beautiful fall afternoon in central South Dakota, the National Geodetic Survey (NGS) and the South Dakota Society of Professional Land Surveyors (SDSPLS) dedicated the brass Corps of Discovery II disk and accompanying bronze plaque. In addition to serving as a monument commemorating the bicentennial of the Lewis and Clark expedition, this disk is also a HARN point which is part of the National Spatial Reference System.
