The Chehalis River Basin Flood Control Zone District (District) is seeking to construct a flood retention facility and associated temporary reservoir near the Lewis County town of Pe Ell, and make levee and other improvements around the Chehalis-Centralia Airport.
We're now conducting an environmental review of the proposal under the State Environmental Policy Act (SEPA). We plan to release our draft review on February 27, 2020, for comments.
Conducting environmental review
We have determined the District’s proposed Chehalis River Basin Flood Damage Reduction Project could have significant adverse environmental impacts. We're preparing a state draft Environmental Impact Statement (EIS) that will identify and analyze how the proposal is likely to affect the environment.
We'll have a public comment period once we release our draft EIS on February 27, 2020, and details will be provided at that time. Please sign up to get email updates on the environmental review and public comment period. Read about where we are in the SEPA EIS process (updated September 2019).
In addition, the U.S. Army Corps of Engineers (Corps) is conducting a separate but synchronized federal review of the District's proposal under the National Environmental Policy Act.
Project description and intent clarified
The District has developed a detailed description of its proposed flood damage reduction project, including supporting documents. In response to questions we and the Corps posed, the District also provided clarifications regarding the project.
For example, the District made clear the proposed flood retention facility and associated temporary reservoir is intended to reduce damages from periodic floods from Pe Ell to Centralia triggered by rainfall in the Willapa Hills. The project is not intended to address flooding in all parts of the Chehalis River basin.
Different environmental elements to be evaluated
The state EIS will study the likely significant environmental impacts from the proposed project as well as project alternatives. Our SEPA analysis will include climate change as we evaluate how the project could affect the following:
Geographic study area could vary
The geographic area we intend to study could vary, depending where probable significant impacts are likely to occur. In general, the study area will be:
- The site of the proposed flood retention facility site near Pe Ell.
- Upriver and downriver where probable impacts could occur.
- The area near the Chehalis-Centralia Airport levee
The study will look at the entire life-cycle of salmon and analyze impacts to chinook salmon that could affect Southern Resident orcas in Puget Sound.
Project alternatives to be analyzed
Besides the proposed project, the EIS also will analyze what is known as a "no action" alternative. This examines what would happen if the flood retention facility is not built or no improvements are made to the airport levee. The study will also analyze an alternative based on localized and nonstructural actions that could help retain flood waters and reduce flood-related damage.
State EIS scoping completed, summary available
Scoping is the first step in the state and federal environmental review process. We and the Corps held a joint SEPA-NEPA EIS scoping period
from Sept. 28 through Oct. 29, 2018 — including conducting two public meetings. During scoping, the public as well as representatives from local and tribal governments, state and federal agencies, the business community, and other organizations provided input regarding the scope of the state EIS.
The comments we heard help identify project alternatives, likely significant adverse impacts, and potential measures to offset negative environmental effects. We will consider the substantive scoping comments we received as we develop the state draft EIS.
The SEPA EIS Scoping Summary Report
provides a summary of scoping comments and outreach. This report will be included in the SEPA draft EIS as well. Visit the EIS Scoping page
to view scoping materials and other information.