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Pacific Right Bank Flood Protection Project
Final Environmental Impact Statement
The Final Environmental Impact Statement for this project is available to view.
Project overview
The King County Flood Control District and its service provider, King County, are proposing to build a flood risk reduction facility in the City of Pacific. The goal of the project is to substantially reduce the risk of flooding in the City of Pacific and improve environmental conditions along this section of the White River. King County has prepared a Final Draft Environmental Impact Statement (Final EIS) analyzing the impacts and benefits of six project alternatives.
The project will extend from the BNSF Railway south to the King-Pierce County boundary line, as shown on the map below.
As part of the Pacific Right Bank Flood Protection Project, King County has been investigating a former dumpsite under Pacific City Park for cleanup under the guidance of the Washington State Department of Ecology’s Voluntary Cleanup Program. King County is conducting additional soil, groundwater, and vapor sampling as part of the multi-step dumpsite investigation.
Project Site
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Final Environmental Impact Statement
In 2024, King County prepared a Draft Environmental Impact Statement (Draft EIS) for the project. The Draft EIS covered aspects of the built and natural environment for five project alternatives. A public comment period for the Draft EIS ran from Oct. 24, 2024 to Dec. 23, 2024. In 2025, King County reviewed feedback on the Draft EIS and added a sixth alternative for the project in response to comments. The Final Environmental Impact Statement (Final EIS) for the project is available to view.
Project goals
- To substantially reduce the potential for White River flooding in the City of Pacific.
- To improve environmental conditions along this portion of the White River.
Project schedule
| Activity |
Date |
|---|---|
| Installed flood risk reduction measures (HESCO barriers) |
October 2009 |
| Started property acquisition |
December 2009 |
| Installed additional HESCO barriers (extension and height) |
November 2013 |
| Started feasibility studies |
October 2014 |
| Public scoping process completed |
April 2018 |
| Conduct environmental review (SEPA) process |
2017 to 2026 |
| Start project design |
2026 - To be determined |
| Target for construction start |
To be determined |
Project documents
Final Environmental Impact Statement
Full PDF of the Final Environmental Impact Statement (23.3 MB)
Full PDF of Appendices A Through F (61.8 MB)
Full PDF of Appendices G Through N (43 MB)
Draft Environmental Impact Statement
Full PDF of the Draft Environmental Impact Statement (160.25 MB)
Full PDF of all Appendices (143.10 MB)
Other project documents
Frequently Asked Questions (308 KB)
Hydraulic Modeling and Geomorphic Response Assessment, 2021 (34.0 MB)
Government Canal Pump Station Alternatives Analysis Technical Memorandum, 2021 (7.32 MB)
Alternatives Analysis Technical Memorandum, 2020 (10.6 MB)
Wetland and Ordinary High Water Mark Delineation Report, 2019 (12.6 MB)
Remedial Investigation Report: Pacific City Park, 2019 (60.79 MB)
Supplemental Remedial Investigation Report: Pacific City Park, 2019 (34.55 MB)
Pacific Park Environmental Investigation, 2017 (9.07 MB)
Pacific Park Phase II Environmental Site Assessment, 2016 (19.11 MB)
Pacific Park Phase I Environmental Site Assessment, 2015 (23.69 MB)
Determination of Significance and Scoping Notice, March 2018 (119 KB)
Environmental Scoping Report, August 2018 (4.23 MB)
Additional project documents available by request: jhoughton@kingcounty.gov.