Colewort Creek Tidal Wetland Restoration

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Oregon’s Colewort Creek tidelands were diked, drained, filled, and converted to pasture in the 19th and early 20th centuries. The tidelands are located at the South Clatsop Slough within Lewis and Clark National Historic Park. Restoration of these historic lands improves salmon habitat in the Columbia River estuary, improves water quality, benefits flood control, and increases habitat diversity.

ESA assisted the Columbia River Estuary Study Task Force and the National Park Service in designing this 44-acre tidal wetland restoration project. ESA was at the ready with practical solutions for this landmark restoration, from conceptual design and the development of design alternatives, to presentations to a Technical Advisory Committee, to construction management. The restoration created more than 4,000 linear feet of new tidal channels and involved removing fill to return marsh plain elevations, creating mounds and hummocks for Sitka spruce planting, installing wood habitat structures, removing invasive vegetation, and planting a variety of trees, shrubs, and other ecologically important species to reestablish native plant communities.  

ESA’s ecologically based restoration has successfully reestablished natural floodplain processes within this historic park.

This project received the Oregon Department of State Lands 2012 Wetland Project Award.

Specialized Services

  • Construction observation and support
  • Design specifications and construction bid packages
  • Engineering design and construction documents
  • Environmental compliance documentation
  • Fisheries habitat enhancement
  • Grade control and bank stabilization
  • Habitat restoration and enhancement
  • Large woody debris and in stream structures
  • Modeling and analysis
  • Native plant revegetation
  • Permitting assistance
  • Restoration and reclamation plans
  • Riparian restoration
  • Schematic and conceptual design
  • Tidal wetlands and marsh restoration
  • Wetland restoration