Marmora. The river powers several small hydroelectric generating stations. The limestone-step falls at Callaghans Rapids Conservation Area and Crowe Bridge Conservation Area are popular sites for springtime kayakers and summertime swimmers. Tributaries Beaver Creek (left) North River (right) Copeway Creek (left) Green River (left) Communities Marmora See also List of rivers of Ontario References Sources Shows the river course. External links Crowe Valley Conservation Authority Rivers of Haliburton County Rivers of Hastings County Rivers of Northumberland County, Ontario Rivers of Peterborough County