Power Generation
A pulp and paper mill (at Témiscaming) and several hydroelectric dams have been constructed on the river. In 1950, the dam at Rapides-des-Joachims, was built, forming Holden Lake behind it and thereby submerging the rapids and portages at Deux Rivières. These hydro dams, like all dams on rivers, have had negative effects upon shoreline and wetland ecosystems, and are thought to also be responsible for the near extermination of American eels, which were once an abundant species in the river, but which are now uncommon . As an economic route, its importance was eclipsed by railroad and highways in the 20th century. It is no longer used for log driving, however, it is still extensively used for recreational boating. Some 20,000 pleasure boaters visit the Carillon Canal annually.
Today, Outaouais Herald Emeritus at the Canadian Heraldic Authority is named after the river.
Read more about this topic: Ottawa River