Our Projects

McSorley Creek Pocket Estuary Restoration Project at Saltwater State Park

McSorley Creek Pocket Estuary Restoration Project at Saltwater State Park

Confluence is working with King County to deliver this project that will reconstruct the beach front, nearshore, tributary stream, and park design of Saltwater State Park to enhance habitat for salmon. Key features of this work include realigning McSorley Creek to restore stream and estuary habitat and the removal of marine shoreline armoring to create […]

SR520 Bridge Replacement Program – Permitting/ESA/Mitigation/Cultural Resources

SR520 Bridge Replacement Program – Permitting/ESA/Mitigation/Cultural Resources

Washington State Department of Transportation (WSDOT) is replacing the State Route (SR) 520 bridge. The work is divided into three projects: West Side/Floating Bridge, East Side Transit and HOV, and Pontoon Construction. Confluence’s leadership in implementing the environmental strategy has enabled WSDOT to meet a very aggressive schedule for environmental project delivery on one of […]

Regulatory Compliance and Permitting for Shellfish Aquaculture

Regulatory Compliance and Permitting for Shellfish Aquaculture

Confluence Environmental Company staff have worked with shellfish growers for many years, individually and collectively. Our scientists have provided regulatory compliance and permitting strategies; developed biological assessments, habitat plans, and permitting documents; researched shellfish ecology; and created study designs for a wide range of shellfish aquaculture projects. Confluence’s work with growers at the individual project […]

Marine Nearshore Restoration Design and Long-Term Management Plan

Marine Nearshore Restoration Design and Long-Term Management Plan

Confluence Environmental Company evaluated coastal processes along 4 miles of Puget Sound shoreline between Mukilteo and the Port of Everett to select priority sites for beneficial reuse of dredge material through beach nourishment and habitat restoration. Confluence assisted the Snohomish County Public Works Department (County) throughout the process — from site evaluation to selection of […]

Environmental Permitting for Industrial Property Development

Environmental Permitting for Industrial Property Development

Sierra Pacific Industries (SPI) developed industrial land in Frederickson, Washington. Confluence Environmental Company served as the lead consultant for site SEPA; critical areas studies; off-site wetland mitigation design and planning; environmental review; and local, state, and federal environmental permitting for the property.  Confluence led the multi-disciplinary team from design of site development through design of […]

Mercer Island Lake Line Permitting

Mercer Island Lake Line Permitting

Confluence Environmental Company staff provided regulatory compliance support, environmental review, permitting, and strategic input integral for the construction of a 2.5-mile, in-lake sewer line segment along the Lake Washington shoreline. The project was particularly challenging because of the sensitive shoreline resources including Endangered Species Act (ESA)-listed species, the technical challenges of maintaining reliable sewer service […]

Mapes Creek Stream Restoration

Mapes Creek Stream Restoration

Confluence Environmental Company assisted the City of Seattle and SvR Design Company in developing draft and final engineering plans and specifications, as well as conducting construction oversight, to restore a piped section of Mapes Creek to an open-channel condition. The habitat restoration project is part of a larger stormwater drainage improvement project conducted by Seattle […]

Marina Redevelopment Biological Evaluation

Marina Redevelopment Biological Evaluation

Confluence Environmental Company assisted Yachtfish Marine NW, Inc. (Yachtfish Marine), in preparing a Biological Evaluation (BE) for the redevelopment of their marina in Port Orchard, Washington. The redevelopment included replacing the existing 50-foot wood piers with new 100-foot grated decking piers; replacing 12,664 square feet of covered moorage area with 11,814 square feet of covered […]