Wilderness Landscape & Natural Heritage
The Columbia Slough Watershed spans approximately 51 square miles across North and Northeast Portland, Oregon. This urban watershed connects the Columbia River to a network of slow-moving sloughs, wetlands, and tributaries, supporting a rich variety of fish, bird, and plant species. Created by the braided flow of the Columbia River and influenced by historic wetlands, the watershed has been shaped by both natural processes and human activity dating back to Native American settlements, early European settlers, and later industrial development. Restoration efforts have been significant in recent decades, aimed at improving water quality, restoring native vegetation, and enhancing habitat connectivity.
Outdoor enthusiasts can enjoy hiking, bird watching, kayaking, and cycling on multi-use paths such as the Waterfront Greenway and the Slough Trail. Notable landmarks include Smith and Bybee Wetlands Natural Area—among the largest urban wetlands in the U.S.—offering interpretive trails and opportunities to observe herons, beavers, and migratory waterfowl. The watershed is also a focus for environmental education and community engagement, with access points and parks providing outdoor classrooms and natural respite close to city areas. Coburg Trail and the docks along the slough facilitate paddle sports and wildlife viewing. Visitors are drawn to the peacefulness of wetland environments contrasted by urban surroundings, making it both an ecological refuge and a recreational asset for the Portland metropolitan area.
