Public Notices

Draft EA: Detroit Dam Risk Reduction

Portland District, U.S. Army Corps of Engineers
Published March 15, 2021
Expiration date: 3/30/2021


Detroit Dam Interim Risk Reduction Measure

Marion County, Oregon

Linn County, Oregon


Issue Date: March 15, 2021
Closing Date: March 30, 2021


15 Day Notice

Interested parties are hereby notified that the U.S. Army Corps of Engineers, Portland District (USACE) is seeking public comment on the Detroit Dam Interim Risk Reduction Measure draft Environmental Assessment (EA) for Detroit Dam And Reservoir. The draft EA was prepared in accordance with the National Environmental Policy Act (NEPA), the Council on Environmental Quality’s NEPA regulations (40 C.F.R. parts 1500–1508), and the Corps’ NEPA regulations (33 C.F.R. part 230).

USACE is proposing to perform operations to reduce the maximum pool elevation to 1558.5 feet (from 1563.5 feet) during the conservation season in order to reduce the likelihood of overstressing the spillway gates during a large earthquake leading to a release of stored water behind the gates.

Assessment of the Need for an Environmental Impact Statement: USACE has preliminarily determined that the proposed action is not likely to result in significant impacts on the human environment, and therefore an environmental impact statement (EIS) will not be prepared. USACE will consider comments received during the 15-day comment period for the draft EA in making a determination on a finding of no significant impact.

Environmental Document:  The draft EA is available here. Appendix A and Appendix B.

Public Comment Period: The draft EA will be available for public comment for 15 days after the date of this public notice. The public comment period is intended to provide those interested in or affected by this action an opportunity to make their concerns or comments known.

Comment Submittal: Please submit written comments to the U.S. Army Corps of Engineers, Portland District: or sent via mail to:

U.S. Army Corps of Engineers
Attn: CENWP-PME-E/Jess Jones
P.O. Box 2946
Portland, OR 97208-2946

All comments, whether by conventional mail or email, must be received no later than the expiration date of this public notice to ensure consideration. Additionally, all comments received will become part of the administrative record and are subject to public release under the Freedom of Information Act, including any personally identifiable information such as name, phone numbers, and addresses. The Corps will respond to public comments in the final EA. 

In your comments, please include in the subject line: Detroit Dam Interim Risk Reduction Measure EA Comment and the date.