The Columbia Slough Watershed Council is a diverse group of neighbors, property owners, businesses, environmental groups, recreation advocates, and government agencies who work to restore and enhance the 60 miles of waterways known as the Columbia Slough, located in Portland, Gresham, and Fairview. The Columbia Slough Watershed Council is a non-profit 501(c)(3) organization. Mission: To foster action to protect, enhance, restore, and revitalize the Slough and its watershed.