 In January 1976, the Improvement District of Matachewan was formed, and in 1995, it was incorporated as a township.The Otisse Lake overflowed into mine tailings on 17 Oct. 1990, and 170,000 cubic metres of mine slimes entered the Matachewan River.In 2006, a medivac helipad was built to help accommodate the possibility of injuries that may occur at the Young-Davidson mine site.