Project Rulison, named after the rural community of Rulison, Colorado, was a 40-kiloton nuclear test project in the United States on September 10, 1969, about 13 kilometres (8 mi) SE of the town of Grand Valley, Colorado (now named Parachute, Colorado) near western Colorado's Grand Valley in Garfield County. The location of "Surface Ground Zero" is (39°24′19.0″N107°56′54.7″W). It was part of the Operation Mandrel weapons test series under the name Mandrel Rulison, as well as the Operation Plowshare project which explored peaceful engineering uses of nuclear explosions.