Environmental
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We’re examining the environmental impacts of constructing and operating the Northgate Bridge. Upon completion, we’ll submit National Environmental Policy Act (NEPA) documents to the Washington State Department of Transportation and Federal Highway Administration for approval. Once they’re approved, we’ll issue a Determination of Non-Significance to satisfy the State Environmental Policy Act (SEPA). We will then issue a SEPA checklist or adopt the NEPA document in lieu of a checklist, which we’ll make available for public review and comment.
Existing Conditions
Environmental Process
This graphic shows the steps to complete the environmental review process. Click on the tabs below to learn more about each phase
- Collect current information to set an environmental baseline
- Review environmental studies completed for projects in the area
- Solicit concerns from the public
- Review early designs to minimize impacts
- Prepare technical reports for areas that will be impacted (i.e., wetlands, water quality, fish and wildlife, cultural resources, transportation, economic, and community)
- Develop documentation for State Environmental Policy Act (SEPA) and National Environmental Policy Act (NEPA)
- Issue SEPA document and solicit public comment
- Prepare SEPA checklist and solicit public comments
Permits and approvals that may be required:
- Section 404/401 Nationwide Permit
- Section 7 Endangered Species Act
- Section 106 National Historic Preservation Act
- Coastal Zone Management Consistency
- Construction Stormwater General Permit
- Hydraulic Project Approval
- Seattle Critical Areas Review
- Section 4(f)