Projects

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Lower Willamette River - River Network

Dahl Beach Mitigation 

Wapato Valley Mitigation and Conservation Bank Wetland Support

Shoalwater Bay Mitigation Bank

Newell Creek Canyon

Fernhill NTS Wetlands Vegetation and Biodiversity Analyses 

Chehalis Basin 

Big Hanaford Creek 

Wallooskee-Youngs

Mitchell Creek

Gallagher Creek

Lower and Middle Molalla River

Greater Yamhill Watershed

Pine Hollow-Jackknife Creek

South Hanaford Basin

Rinearson SlougH

Property Screening Tool

Beaver Creek

Lamprey Migration Study

Rinearson Natural Area

Lower Molalla River Floodplain

Garret Creek

Wetland Delineations for Adapt

Mt Pisgah Viewshed Analysis

Dahl Beach Mitigation Project  
Gladstone, OR

Dahl Beach Mitigation Project

Cascade supported the Port of Portland in the development of the Dahl Beach Mitigation Project to offset impacts stemming from an early action contamination clean up, related to the Portland Harbor Superfund. Impacts including capping sediments in shallow water habitat; Cascade identified a suitable mitigation area on park property, owned by the City of Gladstone.

The mitigation project restored natural riverbank conditions in two locations at the Clackamas and Willamette River confluence. The project removed a portion of a parking lot and a failed sheet pile bulkhead, graded riverbank topography, installed woody habitat structures, and established native vegetation.

Cascade supported the Port’s efforts to work with the City of Gladstone, local user-groups, and permitting agencies to complete the project within a limited timeline. The Dahl Beach project was constructed during summer 2016, and a 5 year monitoring and maintenance program will assure the site performs as designed.

Service Areas

Restoration Project Feasibility and Design
Mitigation Banking, NRDA, and Ecosystem Markets 
Environmental Mitigation